A conviction burst upon my mind that a frightful crime had been committed. By whom and for what purpose I knew not. I hastened to the hotel of the Grand Duke. Tremendous excitement prevailed there, of course. There is no more certain way for a great personage to court publicity than to travel incognito. Everywhere that "M. de Stahler" had appeared all Paris had cried, "There goes the Grand Duke Ivan!" And now as I entered the hotel, press, police and public were demanding: "Is it true that the Grand Duke is dead?" Just emerging from the lift I saw Casimir. In propria persona—as M. Max—he failed to recognize me.  
"My good man," I said—"are you a member of the suite of the late
Grand Duke?"
 
"I am, or was, the valet of M. de Stahler, monsieur," he replied.
 
I showed him my card.
 
"To me 'M. de Stahler' is the Grand Duke Ivan. What other servants had he with him?" I asked, although I knew very well.
 
"None, monsieur."
 
"Where and when was he taken ill?"
 
"At the Theatre Coquerico. Montmartre, at about a quarter past ten o'clock to-night."
 
"Who was with him?"
 
"No one, monsieur. His Highness was alone in a box. I had instructions to call with the car at eleven o'clock."
 
"Well?"
 
"The theatre management telephoned at a quarter past ten to say that His Highness had been taken ill and that a physician had been sent for. I went in the car at once and found him lying in one of the dressing-rooms to which he had been carried. A medical man was in attendance. The Grand Duke was unconscious. We moved him to the car——"
 
"We?"
 
"The doctor, the theatre manager, and myself. The Grand Duke was then alive, the physician declared, although he seemed to me to be already dead. But just before we reached the hotel, the physician, who was watching His Highness anxiously, cried, 'Ah,mon Dieu! It is finished. What a catastrophe!'"
 
"He was dead?"
 
"He was dead, monsieur."
 
"Who has seen him?"
 
"They have telephoned for half the doctors in Paris, monsieur, but it is too late."
 
He was affected, the good Casimir. Tears welled up in his eyes. I mounted in the lift to the apartment in which the Grand Duke lay. Three doctors were there, one of them being he of whom Casimir had spoken. Consternation was written on every face.
 
"It was his heart," I was assured by the doctor who had been summoned to the theatre. "We shall find that he suffered from heart trouble."
 
They were all agreed upon the point.
 
"He must have sustained a great emotional shock," said another.
 
"You are convinced that there was no foul play, gentlemen?" I asked.
 
They were quite unanimous on the point.
 
"Did the Grand Duke make any statement at the time of the seizure which would confirm the theory of a heart attack?"
 
No. He had fallen down unconscious outside the door of his box, and from this unconsciousness he had never recovered. (Depositions of witnesses, medical evidence and other documents are available for the guidance of whoever may care to see them, but, as is well known, the death of the Grand Duke was ascribed to natural causes and it seemed as though my trouble would after all prove to be in vain.) Let us see what happened.
 
Leaving the hotel, on the night of the Grand Duke's death, I joined the man who was watching the cafe telephone.
 
There had been a message during the course of the evening, but it had been for a Greek cigarette-maker and it referred to the theft of several bales of Turkish tobacco—useful information, of minor kind, but of little interest to me. I knew that it would be useless to question the man Miguel, although I strongly suspected him of being a member of "The Scorpion's" organization. Any patron of the establishment enjoyed the privilege of receiving private telephone calls at the cafe on payment of a small fee.
 
A man of less experience in obscure criminology might now have assumed that he had been misled by a series of striking coincidences. Remember, there was not a shadow of doubt in the minds of the medical experts that the Grand Duke had died from syncope. His own professional advisor had sent written testimony to show that there was hereditary heart trouble, although not of a character calculated to lead to a fatal termination except under extraordinary circumstances. His own Government, which had every reason to suspect that the Grand Duke's assassination might be attempted, was satisfied. Eh bien! I was not.
 
I cross-examined the manager of the Theatre Coquerico. He admitted that Mlle. Zara el-Khala had been a mystery throughout her engagement. Neither he nor anyone else connected with the house had ever entered her dressing-room or held any conversation with her, whatever, except the stage-manager and the musical director. These had spoken to her about her music and about lighting and other stage effects. She spoke perfect French.
 
Such a state of affairs was almost incredible, but was explained by the fact that the dancer, at a most modest salary, had doubled the takings of the theatre in a few days and had attracted capacity business th............