With a little laugh of sheer light heartedness on her lips and a twinkle in her blue eyes, Marguerite Melrose bound on a grotesque automobile mask, and stuffed the last strand of her recalcitrant hair beneath her veil. The pretty face was hidden from mouth to brow; and her curls were ruthlessly imprisoned under a cap held in place by the tightly tied veil.

“It’s perfectly hideous, isn’t it?” she demanded of her companions.

Jack Curtis laughed.

“Well,” he remarked, quizzically, “it’s just as well that we know you are pretty.”

“We could never discover it as you are now,” added Charles Reid. “Can’t see enough of your face to tell whether you are white or black.”

The girl’s red lips were pursed into a pout, which ungraciously hid her white teeth, as she considered the matter seriously.

“I think I’ll take it off,” she said at last.

“Don’t,” Curtis warned her. “On a good road The Green Dragon only hits the tall places.”

“Tear your hair off,” supplemented Reid. “When Jack lets her loose it’s just a pszzzzt! — and wherever you’re going you’re there.”

“Not on a night as dark as this?” protested the girl, quickly.

“I’ve got lights like twin locomotives,” Curtis assured her, smilingly. “It’s perfectly safe. Don’t get nervous.”

He tied on his own mask with its bleary goggles, while Reid did the same. The Green Dragon, a low, gasoline car of racing build, stood panting impatiently, awaiting them at a side door of the hotel. Curtis assisted Miss Melrose into the front seat and climbed in beside her, while Reid sat behind in the tonneau. There was a preparatory quiver, the car jerked a little and then began to move.

The three persons in it were Marguerite Melrose, an actress who had attracted attention in the West five years before by her great beauty and had afterwards, by her art, achieved a distinct place; Jack Curtis, a friend since childhood, when both lived in San Francisco and attended the same school, and Charles Reid, his chum, son of a mine owner at Denver.

The unexpected meeting of the three in Boston had been a source of mutual pleasure. It had been two years since they had seen one another in Denver, where Miss Melrose was playing. Now she was in Boston, pursuing certain vocal studies before returning West for her next season.

Reid was in Boston to lay siege to the heart of a young woman of society, Miss Elizabeth Dow, whom he first met in San Francisco. She was only nineteen years old, but despite this he had begun a siege and his ardor had never cooled, even after Miss Dow returned East. In Boston, he had heard, she looked with favor upon another man, Morgan Mason, poor but of excellent family, and frantically Reid had rushed, like Lochinvar out of the West, to find the rumor true.

Curtis was one who never had anything to do save seek excitement in a new and novel way. He had come East with Reid. They had been together constantly since their arrival in Boston. He was of a different type from Reid in that his wealth was distinctly a burden, a thing which left him with nothing to do, and opened illimitable possibilities of dissipation. The pace he led was one which caused other young men to pause and think.

Warm-hearted and perfectly at home with both Curtis and Reid, Miss Melrose, the actress, frequently took occasion to scold them. It was charming to be scolded by Miss Melrose, so much so in fact that it was worth while sinning again. Since she had appeared on the horizon Curtis had devoted a great deal of time to her; Reid had his own difficulties trying to make Miss Dow change her mind.

The Green Dragon with its three passengers ran slowly down from the Hotel Yarmouth, where Miss Melrose was stopping, toward the Common, twisting and winding tortuously through the crowd of vehicles. It was halfpast six o’clock in the evening.

“Cut across here to Commonwealth Avenue,” Miss Melrose suggested. She remembered something and her bright blue eyes sparkled beneath the disfiguring mask. “I know a delightful old-fashioned inn out this way. It would be an ideal place to stop for supper. I was there once five years ago when I was in Boston.”

“How far?” asked Reid.

“Fifteen or twenty miles,” was the reply.

“Right,” said Curtis. “Here we go.”

Soon after they were skimming along Commonwealth Avenue, which at that time of day is practically given over to automobilists, past the Vendome, the Somerset and on over the flat, smooth road. It was perfectly light now, because the electric lights were about them; but there was no moon above, and once in the country it would be dark going.

Curtis was intent on his machine; Reid was thoughtful for a time, but after awhile leaned over and talked to Miss Melrose.

“I heard something today that might interest you,” he remarked.

“What is it?” she asked.

“Don MacLean is in Boston.”

“I heard that,” she replied, casually.

“Who is he?” asked Curtis.

“A man who is frantically in love with Marguerite,” said Reid, with a smile.

“Charlie,” the girl reproved, and a flush crept into her face. “It was never anything very serious.”

Curtis looked at her curiously for a moment, then his eyes turned again to the road ahead.

“I don’t suppose it’s very serious if a man proposes to a girl seven times, is it?” Reid asked, banteringly.

“Did he do that?” asked Curtis, quickly.

“He merely made a fool of himself and me,” replied the actress, with spirit, speaking to Curtis. “He was — in love with me, I suppose, but his family objected because I was on the stage and threatened to disinherit him, and all that sort of thing. So — it ended it. Not that I ever considered the matter seriously anyway,” she added.

There was silence again as The Green Dragon plunged into the darkness of the country, the two brilliant lights ahead showing every dip and rise in the road. After awhile Curtis spoke again.

“He’s now in Boston?”

“Yes,” said the girl. “At least, I’ve heard so,” she added, quickly.

Then the conversation ran into other channels, and Curtis, busy with the great machine and the innumerable levers which made it do this or do that or do the other, dropped out of it. Reid and Miss Melrose talked on, but the whirr of the car as it gained speed made talking unsatisfactory and finally the girl gave herself up to the pure delight of high speed; a dangerous pleasure which sets the nerves atingle and makes one greedy for more.

“Do you smell gasoline?” Curtis asked suddenly, turning to the others.

“Believe I do,” said Reid.

“Confound it! If I’ve sprung a leak in my tank it will be the deuce,” Curtis growled amiably.

“Do you think you’ve got enough to get to the inn?” asked Miss Melrose. “It can’t be more than five or six miles now.”

“I’ll run on until we stop,” said Curtis. “We might be able to stir up some along here somewhere. I suppose they are prepared for autos.”

At last lights showed ahead, many lights glimmering through the trees.

“I suppose that’s the inn now,” said Curtis. “Is it?” he asked of the girl.

“Really, I don’t know, but I have an impression that it isn’t. The one I mean seems farther out than this and it seems to me we passed one on the way. However, I don’t remember very well.”

“We’ll stop and get some gasoline, anyhow,” said Curtis.

Puffing and snorting odorously The Green Dragon came to a standstill in front of an old house which stood back twenty feet or more from the road. It was lighted up, and from inside they could hear the cheery rattle of dishes and see white-aproned waiters moving about. Above the door was a sign, “Monarch Inn.”

“Is this the place?” asked Reid.

“Oh, no,” replied Miss Melrose. “The inn I spoke of was back from the road three or four hundred feet through a grove.”

Curtis leaped out, and evidently dropped something from his pocket as he did so, for he stopped and felt around for a moment. Then he examined his tank.

“It’s a leak,” he said, in irritation. “I haven’t more than half a gallon left. These people must have some gasoline. Wait a few minutes.”

Miss Melrose and Reid still sat in the car as he started away toward the house. Almost at the veranda he turned and called back:

“Charlie, I dropped something there when I jumped out. Get down and strike a match and see if you can find it. Don’t go near that gasoline tank with the match.”

He disappeared inside the house. Reid climbed out and struck several matches. Finally he found what was lost and thrust it into an outside pocket. Miss Melrose was gazing away down the road at two brilliant lights coming toward them rapidly.

“Rather chilly,” Reid said, as he straightened up. “Want a cup of coffee or something?”

“Thanks, no,” the girl replied.

“I think I’ll run in and scare up some sort of a hot drink, if you’ll excuse me?”

“Now, Charlie, don’t,” the girl asked, suddenly. “I don’t like it.”

“Oh, one won’t hurt,” he replied, lightly.

“I shan’t speak to you when you come out,” she insisted, half banteringly.

“Oh, yes, you will.” He laughed, and passed into the house.

Miss Melrose tossed her pretty head impatiently and turned to watch the approaching lights. They were blinding as they drew nearer, clearly revealing her figure, in its tan auto coat, to the occupant of the other car. The newcomer stopped and then she heard whoever was in it — she couldn’t see — speaking to her.

“Would you mind turning your car a little so I can run in off the road?”

“I don’t know how,” she replied, helplessly.

There was a little pause. The occupant of the other car was leaning forward, looking at her closely.

“Is that you, Marguerite?” he asked finally.

“Yes,” she replied. “Who is that? Don?”

“Yes.”

A man’s figure leaped out of the other machine and came toward her.

Curtis appeared beside the Green Dragon with a huge can of gasoline twenty minutes later. The two occupants of the car were clearly silhouetted against the sky, and Reid, leaning back in the tonneau, was smoking.

“Find it?” he asked.

“Yes,” growled Curtis. And he began the work of repairing the leak and refilling his tank. It took only five minutes or so, and then he climbed up into the car.

“Cold, Marguerite?” he asked.

“She won’t speak,” said Reid, leaning forward a little. “She’s angry because I went inside to get a hot Scotch.”

“Wish I had one myself,” said Curtis.

“Let’s wait till we get to the next place,” Reid interposed. “A little supper and trimmings will put all of us in a better humor.”

Without answering, Curtis threw a lever, and the car pulled out. Two automobiles which had been standing when they arrived were still waiting for their owners. Annoyed at the delay, Curtis put on full speed. Finally Reid leaned forward and spoke to the girl.

“In a good humor?” he asked.

She gave no sign of having heard, and Reid placed his hand on her shoulder as he repeated the question. Still there was no answer.

“Make her talk to you, Jack,” he suggested to Curtis.

“What’s the matter, Marguerite?” asked Curtis, as he glanced around.

Still there was no answer, and he slowed up the car a little. Then he took her arm and shook it gently. There was no response.

“What is the matter with her?” he demanded. “Has she fainted?”

Again he shook her, this time more vigorously than before.

“Marguerite,” he called.

Then his hand sought her face; it was deathly cold, clammy even about the chin. The upper part was still covered by the mask. For the third time he shook her, then, really frightened, apparently, he caught at her gloved wrist and brought the car to a standstill. There was no trace of a pulse; the wrist was cold as death.

“She must be ill — very ill,” he said in some agitation. “Is there a doctor near here?”

Reid was leaning over the senseless body now, having raised up in the tonneau, and when he spoke there seemed to be fear in his tone.

“Better run on as fast as you can to the inn ahead,” he instructed Curtis. “It’s nearer than the one we just left. There may be a doctor there.”

Curtis grabbed frantically at the lever and the car shot ahead suddenly through the dark. In three minutes the lights of the second inn were in sight. The two men leaped from the car simultaneously and raced for the house.

“A doctor, quick,” Curtis breathlessly demanded of a waiter.

“Next door.”

Without waiting for further instructions, Curtis and Reid ran to the auto, lifted the girl in their arms and took her to a house which stood just a few feet away. There, after much clamoring, they aroused some one. Was the doctor in? Yes. Would he hurry? Yes.

The door opened and the men laid the girl’s body on a couch in the hall. Dr. Leonard appeared. He was an old fellow, grizzled, with keen, kindly eyes and rigid mouth.

“What’s the matter?” he asked.

“Think she’s dead,” replied Curtis.

The doctor adjusted his glasses rather hurriedly.

“Who is she?” he asked, as he bent over the still figure and fumbled about the throat and breast.

“Miss Marguerite Melrose, an actress,” explained Curtis, hurriedly.

“What’s the matter with her?” demanded Reid, fiercely.

The doctor still bent over the figure. In the dim lamplight Curtis and Reid stood waiting anxiously, impatiently, with white faces. At last the doctor straightened up.

“What is it?” demanded Curtis.

“She’s dead,” was the reply.

“Great God!” exclaimed Reid. “How?” Curtis seemed speechless.

“This,” said the doctor, and he exhibited a long knife, damp with blood. “Stabbed through the heart.”

Curtis stared at him, at the knife, then at the inert figure, and lastly at the dead white of her face where it showed beneath the mask.

“Look, Jack!” exclaimed Reid, suddenly. “The knife!”

Curtis looked again, then sank down on the couch beside the body.

“Oh, my God! It’s horrible!” he said.
2

To Hutchinson Hatch and half a dozen other reporters, Dr. Leonard, at his home late that night, told the story of the arrival of Jack Curtis and Charles Reid with the body of the girl, and the succeeding events so far as he knew them. The police and Medical Examiner Francis had preceded the newspaper men, and the body had been removed to a nearby village.

“They came here in great excitement,” Dr. Leonard explained. “They brought the body in with them, the man Curtis lifting her by the shoulders and the man Reid at the feet. They placed the body on this couch. I asked them who she was, and they told me she was Marguerite Melrose, an actress. That’s all that was said of her identity.

“Then I made an examination of the body, seeking a trace of life. There was none, although the body was not then entirely cold. In examining her heart my hand struck the knife which had killed her — a heavy weapon, evidently used for rough work, with a blade of six or seven inches. I drew the knife out. Of course, knowing that it had pierced her heart, any idea of doing anything to save her was beyond question.

“One of the men, Curtis, seemed greatly excited about this knife after Reid called his attention to it. Curtis took the knife out of my hand and examined it closely, then asked if he might keep it. I told him it would have to be turned over to the medical examiner. He argued about it, and finally, to settle the argument, I took it out of his hand. Reid explained to Curtis that it was necessary for me to keep the knife, and finally Curtis seemed to agree to it.

“Then I suggested that the police be notified. I did this myself by telephone, the men remaining with me all the time. I asked if they could throw any light on the tragedy, but neither could. Curtis said he had been out searching for a man who had the keys to a shed where some gasoline was locked up, and it took fifteen or twenty minutes to find him. As soon as he got the gasoline he returned to the auto.

“Reid and Miss Melrose were at this time in the auto, he said. What had happened while he had been away Curtis didn’t know. Reid said he, too, had stepped out of the automobile, and after exchanging a few words with Miss Melrose went into the inn. There he remained fifteen minutes or so, because inside he saw a woman he knew and spoke to her. He declared that any one of three waiters could verify his statement that he was in the Monarch Inn.

“After I had notified the police Curtis grew very uneasy in his actions — it didn’t occur to me at the moment, but now I recall that it was so — and suggested to Reid that they go on to Boston and send out detectives — special Pinkerton men. I tried to dissuade them, but they went away. I couldn’t stop them. They gave me their cards, however. They are at the Hotel Teutonic, and told me they could be seen there at any time. The medical examiner and the police came afterwards. I told them, and one of the detectives started immediately for Boston. They have probably told their story to him by this time.”

“What did the young woman look like?” asked Hatch.

“Really, I couldn’t say,” said the doctor. “She wore an automobile mask which covered all her face except the chin, and there was a veil tied over her cap, concealing her hair. I didn’t remove these; I left the body just as it was for the medical examiner.”

“How was she dressed?” Hatch went on.

“She wore a long tan automobile dust coat of what seemed to be rich material, and beneath this a handsome — not a fancy — gown. I believe it was tailor-made. She was a woman of superb figure.”

That was all that could be learned from Dr. Leonard, and Hatch and the other men raced back to Boston. The next day the newspapers flamed with the mystery of the murder of Miss Melrose, a beautiful Western actress who was visiting Boston. Each newspaper watched the other greedily to see if there was a picture of Miss Melrose; neither had one.

The newspapers also carried the stories of Jack Curtis and Charles Reid in connection with the murder. The stories were in substance just what Dr. Leonard had said, but were given in more detail. It was the general presumption, almost a foregone conclusion, that some one had killed Miss Melrose while the two men were away from the auto.

Who was this some one? Man or woman? No one could answer. Reid’s story of being inside the Monarch Inn, where he spoke to a lady he knew — but whose name he refused to give — was verified by Hatch’s paper. Three waiters had seen him.

The medical examiner had made only a brief statement, in which he had said, in answer to a question, that the person who killed Miss Melrose might have been either at her right, in the position Curtis would have occupied while driving the car, or might have leaned forward from behind and stabbed her. Thus it was not impossible that one of the men in the car with her had killed her, yet against this possibility was the fact that each of the men was one whom one could not readily associate with such a crime.

The fact that the fatal blow was delivered from the right was proven, said the astute medical examiner, by the fact that the knife slanted as a knife could not have been slanted conveniently by a person on her other side — her left. There were many dark, underlying intimations behind what the medical man said; but he refused to say any more. Meanwhile the body remained in the village where it had been taken. Efforts to get a photograph were unavailing; pleas of newspaper artists for permission to sketch her fell upon deaf ears.

Curtis and Reid, after their first statements, remained in seclusion at the Teutonic. They were not arrested because this did not seem necessary. Both had offered to do anything in their power to solve the riddle, had even employed Pinkerton men who were now on the case; but they would say nothing nor see anyone except the police. The police encouraged them in this attitude, and hinted darkly and mysteriously at clews which “would lead to an arrest within twenty four hours.”

Hatch read these intimations and smiled grimly. Then he went out to try what a little patience and perseverance and human intelligence would do. He learned something of Reid’s little romance in Boston. Yet not all of it. It was a fact, however, that Reid had called at the home of Miss Elizabeth Dow on Beacon Hill just after noon and inquired for her.

“She is not in,” the maid had replied.

“I’ll leave my card for her,” said Reid.

“I don’t think she’ll he back,” the girl answered.

“Not be back?” Reid repeated “Why?”

“Haven’t you seen the afternoon papers?” asked the girl. “They will explain. Mrs. Dow, her mother, told me not to tell to anyone.”

Reid left the house with a wrinkle in his brow and walked on toward the Common. There he halted a newsboy and bought an afternoon paper — many afternoon papers. The first pages were loaded with details of the murder of Miss Melrose, theories, conjectures, a thousand little things, with long dispatches of her history and her stage career from San Francisco.

Reid passed these over impatiently with a slight shiver and looked inside the paper. There he found the thing to which the maid had referred.

“By George!” he exclaimed.

It was a story of the elopement of Elizabeth Dow with Morgan Mason, Reid’s rival. It seemed that Miss Dow and Mason met by appointment at the Monarch Inn and went from there in an automobile. The bride had written to her parents before she started, saying she preferred Mason despite his poverty. The family refused to talk of the matter. But there in facsimile was the marriage license.

Reid’s face was a study as he walked back to the hotel. In a private room off the cafe he found Curtis, who had been drinking heavily, yet who, with the strange mood of some men, was not visibly intoxicated. Reid threw the paper down, open at the elopement announcement.

“See that,” he said shortly.

Curtis read it — or glanced at it — but did not make a remark until he came to the name, the Monarch Inn. Then he looked up.

“That’s where the other thing happened, isn’t it?” he asked, rather thickly.

“Yes.”

Curtis rambled off into something else; studiously he avoided any reference to the tragedy, yet that was the one thing which was in his mind. It was in a futile effort to forget it that he was drinking now. He talked on as a drunken man will for a time, then turned suddenly to Reid.

“I loved her,” he declared suddenly, passionately. “My God!”

“Try not to think of it,” Reid advised.

“You’ll never say anything about that other thing — the knife — will you?” pleaded Curtis.

“Of course not,” said Reid, impatiently. “They couldn’t drag it out of me. But you’re drinking too much — you want to quit it. First thing you know you’ll be saying more than — get up and go out and take a walk.”

Curtis stared at Reid vacantly for a moment, as if not understanding, then arose. He had regained possession of himself to a certain extent, but his face was pale.

“I think I will go out,” he said.

After a time he passed through the cafe door into a side street and, refreshed a little by the cool air, started to walk along Tremont Street toward the shopping district. It was two o’clock in the afternoon and the streets were thronged.

Half a dozen reporters were idling in the lobby of the hotel, waiting vainly for either Reid or Curtis. The newspapers were shouting for another story from the only two men who could know a great deal of the circumstances attending the tragedy. Reid, on his return, had marched boldly through the crowd of reporters, paying no attention to their questions. They had not seen Curtis.

As Curtis, now free of the reporters, crossed a side street on Tremont on his way toward the shopping district he met Hutchinson Hatch, who was bound for the hotel to see his man there. Hatch instantly recognized him and fell in behind, curious to see where he would go. At a favorable opportunity, safe beyond reach of the other men, he intended to ask a few questions.

Curtis turned into Winter Street and strolled along through the crowd of women. Half way down Winter Street Hatch followed, and then for a moment he lost sight of him. He had gone into a store, he imagined. As he stood at a door waiting, Curtis came out, rushed through the crowd of women, slinging his arms like a madman, with frenzy in his face. He ran twenty steps, then stumbled and fell.

Hatch immediately ran to his assistance, lifted him up and gazed into the staring, terror stricken eyes and an ashen face.

“What is it?” asked Hatch, quickly.

“I— I’m very ill. I— I think I need a doctor,” gasped Curtis. “Take me somewhere, please.”

He fell back limply, half fainting, into Hatch’s arms. A cab came worming through the crowd; Hatch climbed into it, assisting Curtis, and gave some directions to the cabby.

“And hurry,” he added. “This gentleman is ill.”

The cabby applied the whip and drove out into Tremont, then over toward Park Street. Curtis aroused a little.

“Where’re we going?” he demanded.

“To a doctor,” replied Hatch.

Curtis sank back with eyes closed and his face white — so white that Hatch felt of the pulse to assure himself that the heart was still beating. After a few minutes the cab stopped and, still assisting Curtis, Hatch went to the door. An aged woman answered the bell.

“Professor Van Dusen here?” asked the reporter.

“Yes.”

“Please tell him that Mr. Hatch is here with a gentleman who needs immediate attention,” Hatch directed, hurriedly.

He knew his way here and, still supporting Curtis, walked in. The woman disappeared. Curtis sank down on a couch in the little reception room, looked at Hatch glassily for a moment, then without a sound dropped back on the couch unconscious.

After a moment the door opened and there came in Professor Augustus S. F. X. Van Dusen, The Thinking Machine. He squinted inquiringly at Hatch, and Hatch waved his head toward Curtis.

“Dear me, dear me,” exclaimed The Thinking Machine.

He leaned over the prostrate figure a moment, then disappeared into another room, returning with a hypodermic. After a few anxious minutes Curtis sat up straight. He stared at the two men with unseeing eyes, and in them was unutterable terror.

“I saw her! I saw her!” he screamed. “There was a dagger in her heart. Marguerite!”

Again he fell back unconscious. The Thinking Machine squinted at Hatch.

“The man’s got delirium tremens,” he snapped impatiently.
3

For fifteen minutes Hatch silently looked on as The Thinking Machine worked over the unconscious man. Once or twice Curtis moved uneasily and moaned slightly. Hatch had started to explain the situation to The Thinking Machine, but the irascible scientist glared at him and the reporter became silent. After ten or fifteen minutes The Thinking Machine turned to Hatch more genially.

“He’ll be all right in a little while now,” he said. “What is it?”

“Well, it’s a murder,” Hatch began. “Marguerite Melrose, an actress, was stabbed through the heart last night, and —”

“Murder?” interrupted The Thinking Machine. “Might it not have been suicide?”

“Might have been; yes,” said the reporter, after a moment’s pause. “But it appears to be murder.”

“When you say it is murder,” said The Thinking Machine, “you immediately give the impression that you were there and saw it. Go on.”

From the beginning, then, Hatch told the story as he knew it; of the stopping of The Green Dragon at the Monarch Inn, of the events there, of the whereabouts of Curtis and Reid at the time the girl received the knife thrust and of the confirmation of Reid’s story. Then he detailed those incidents of the arrival of the men with the girl at Dr. Leonard’s house, of what had transpired there, of the effort Curtis had made to get possession of the knife.

With finger tips pressed together and squinting steadily upward, The Thinking Machine listened. At its end, which bore on the actions of Curtis just preceding his appearance in the room with them, The Thinking Machine arose and walked over to the couch where Curtis lay. He ran his slender fingers idly through the unconscious man’s thick hair several times.

“Doesn’t it strike you as perfectly possible, Mr. Hatch,” he asked finally, “that Miss Melrose did kill herself?”

“It may be perfectly possible, but it doesn’t appear so,” said Hatch. “There was no motive.”

“And certainly you’ve shown no motive for anything else,” said the other, crustily. “Still,” he mused, “I really can’t say anything until I talk to him.”

He again turned to his patient, and as he looked saw the red blood surge back into the face.

“Ah, now we’re all right,” he announced.

Thus it happened, for after another ten minutes the patient sat up suddenly on the couch and looked at the two men before him, bewildered.

“What’s the matter?” he asked. The thickness was gone from his speech; he was himself again, although a little shaky.

Briefly, Hatch explained to him what had happened, and he listened silently. Finally he turned to The Thinking Machine.

“And this gentleman?” he asked. He noted the queer appearance of the scientist, and stared into the squint eyes frankly.

“Professor Van Dusen, a distinguished scientist and physician,” Hatch introduced. “I brought you here. He has been working with you for an hour.”

“And now, Mr. Curtis,” said The Thinking Machine, “if you will tell us all you know about the murder of Miss Melrose —”

Curtis paled suddenly.

“Why do you ask me?” he demanded.

“You said a great deal while you were unconscious,” remarked The Thinking Machine, as he dreamily stared at the ceiling. “I know that worry over that and too much alcohol have put you in a condition bordering on nervous collapse. I think it would be better if you told it all.”

Hatch instantly saw the trend of the scientist’s remarks, and remained discreetly silent. Curtis stared at both for a moment, then paced nervously across the room. He did not know what he might have said, what chance word might have been dropped. Then, apparently, he made up his mind, for he stopped suddenly in front of The Thinking Machine.

“Do I look like a man who would commit murder?” he asked.

“No, you do not,” was the prompt response.

His recital of the story was similar to that of Hatch, but the scientist listened carefully.

“Details! details!” he interrupted once.

The story was complete from the moment Curtis jumped out of the car until the return to the hotel of Curtis and Reid. There the narrator stopped.

“Mr. Curtis, why did you try to induce Dr. Leonard to give up the knife to you?” asked The Thinking Machine, finally.

“Because — well, because —” He faltered, flushed and stopped.

“Because you were afraid it would bring the crime home to you?” asked the scientist.

“I didn’t know what might happen,” was the response.

“Is it your knife?”

Again the tell-tale flush overspread Curtis’s face.

“No,” he said, flatly.

“Is it Reid’s knife?”

“Oh, no,” he said, quickly.

“You were in love with Miss Melrose?”

“Yes,” was the steady reply.

“Had she ever refused to marry you?”

“I had never asked her.”

“Why?”

“Is this a third degree?” demanded Curtis, angrily, and he arose. “Am I a prisoner?”

“Not at all,” said The Thinking Machine, quietly. “You may be made a prisoner, though, on what you said while unconscious. I am merely trying to help you.”

Curtis sank down in a chair with his head in his hands and remained motionless for several minutes. At last he looked up.

“I’ll answer your questions,” he said.

“Why did you never ask Miss Melrose to marry you?”

“Because — well, because I understood another man, Donald MacLean, was as in love with her, and she might have loved him. I understood she would have married him had it not been that by doing so she would have caused his disinheritance. MacLean is now in Boston.”

“Ah!” exclaimed The Thinking Machine.

“Your friend Reid didn’t happen to be in love with her, too, did he?”

“Oh, no,” was the reply. “Reid came here hoping to win the love of Miss Dow, a society girl. I came with him.”

“Miss Dow?” asked Hatch, quickly. “The girl who eloped last night with Morgan Mason?”

“Yes,” replied Curtis. “That elopement and this — crime have put Reid almost in as bad a condition as I am.”

“What elopement?” asked The Thinking Machine.

Hatch explained how Mason had procured a marriage license, how Miss Dow and Mason had met at the Monarch Inn — where Miss Melrose must have been killed according to all stories — how Miss Dow had written to her parents from there of the elopement and then of their disappearance. The Thinking Machine listened, but without apparent interest.

“Have you such a knife as was used to kill Miss Melrose?” he asked at the end.

“No.”

“Did you ever have such a knife?”

“Well, once.”

“Where did you carry it when it was not in your auto kit?”

“In my lower coat pocket.”

“By the way, what kind of looking woman was Miss Melrose?”

“One of the most beautiful women I ever met,” said Curtis with a certain enthusiasm. “Of ordinary height, superb figure — a woman who would attract attention anywhere.”

“I believe she wore a veil and an automobile mask at the time she was killed?”

“Yes. They covered all her face except her chin.”

“Could she, wearing an automobile mask, see either side of herself without turning?” asked The Thinking Machine, pointedly. “Had you intended to stab her, say while the car was in motion and had the knife in your hand, even in daylight, could she have seen it without turning her head? Or, if she had had the knife, could you have seen it?”

Curtis shuddered a little.

“No, I don’t believe so.”

“Was she blonde or brunette?”

“Blonde, with great clouds of golden hair,” said Curtis, and again there was admiration in his tone.

“Golden hair?” Hatch repeated. “I understood Medical Examiner Francis to say she had dark hair?”

“No, golden hair,” was the positive reply.

“Did you see the body, Mr. Hatch?” asked the scientist.

“No. None of us saw it. Dr. Francis makes that a rule.”

The Thinking Machine arose, excused himself and passed into another room. They heard the telephone bell ring and then some one closed the door connecting the two rooms. When the scientist returned he went straight to a point which Hatch had impatiently awaited.

“What happened to you this afternoon in Winter Street?”

Curtis had retained his composure well up to this point; now he became uneasy again. Quick pallor on his face was succeeded by a flush which crept up to the roots of his hair.

“I’ve been drinking too much,” he said at last. “That and this thing have completely unnerved me. I am afraid I was not myself.”

“What did you think you saw?” insisted The Thinking Machine.

“I went into a store for something. I’ve forgotten what now. I know there was a great crowd of women — they were all about me. There I saw —” He stopped and was silent for a moment. “There I saw,” he went on with an effort, “a woman — just a glimpse of her, over the heads of the others in the store — and —”

“And what?” insisted The Thinking Machine.

“At the moment I would have sworn it was Marguerite Melrose,” was the reply.

“Of course you know you were mistaken?”

“I know it now,” said Curtis. “It was a chance resemblance, but the effect on me was awful. I ran out of there shrieking — it seemed to me. Then I found myself here.”

“And you don’t know what you said or did from that time until the present?” asked the scientist, curiously.

“No, except in a hazy sort of way.”

After awhile Martha, the scientist’s aged servant, appeared in the doorway.

“Mr. Mallory and a gentleman, sir.”

“Let them come in,” said The Thinking Machine. “Mr. Curtis,” and he turned to him gravely, “Mr. Reid is here. I sent for him as if at your request to ask him two questions. If he answers those questions, as I believe he will, I can demonstrate that you are not guilty of and have no connection with the murder of Miss Melrose. Let me ask these questions, without any hint or remark from you as to what the answer must be. Are you willing?”

“I am,” replied Curtis. His face was white, but his voice was firm.

Detective Mallory, whom Curtis didn’t know, and Charles Reid entered the room. Both looked about curiously. Mallory nodded brusquely at Hatch. Reid looked at Curtis and Curtis looked away.

“Mr. Reid,” said The Thinking Machine without any preliminary, “Mr. Curtis tells me that the knife used to kil............