In utter darkness we groped our way through into the hallway of Slattin’s house, having entered, stealthily, from the rear; for Smith had selected the study as a suitable base of operations. We reached it without mishap, and presently I found myself seated in the very chair which Karamaneh had occupied; my companion took up a post just within the widely opened door.  
So we commenced our ghostly business in the house of the murdered man—a house from which, but a few hours since, his body had been removed. This was such a vigil as I had endured once before, when, with Nayland Smith and another, I had waited for the coming of one of Fu-Manchu’s death agents.
 
Of all the sounds which, one by one, now began to detach themselves from the silence, there was a particular sound, homely enough at another time, which spoke to me more dreadfully than the rest. It was the ticking of the clock upon the mantelpiece; and I thought how this sound must have been familiar to Abel Slattin, how it must have formed part and parcel of his life, as it were, and how it went on now—tick-tick-tick-tick—whilst he, for whom it had ticked, lay unheeding—would never heed it more.
 
As I grew more accustomed to the gloom, I found myself staring at his office chair; once I found myself expecting Abel Slattin to enter the room and occupy it. There was a little China Buddha upon the bureau in one corner, with a gilded cap upon its head, and as some reflection of the moonlight sought out this little cap, my thoughts grotesquely turned upon the murdered man’s gold tooth.
 
Vague creakings from within the house, sounds as though of stealthy footsteps upon the stair, set my nerves tingling; but Nayland Smith gave no sign, and I knew that my imagination was magnifying these ordinary night sounds out of all proportion to their actual significance. Leaves rustled faintly outside the window at my back: I construed their sibilant whispers into the dreaded name—Fu-Manchu-Fu-Manchu—Fu-Manchu!
 
So wore on the night; and, when the ticking clock hollowly boomed the hour of one, I almost leaped out of my chair, so highly strung were my nerves, and so appallingly did the sudden clangor beat upon them. Smith, like a man of stone, showed no sign. He was capable of so subduing his constitutionally high-strung temperament, at times, that temporarily he became immune from human dreads. On such occasions he would be icily cool amid universal panic; but, his object accomplished, I have seen him in such a state of collapse, that utter nervous exhaustion is the only term by which I can describe it.
 
Tick-tick-tick-tick went the clock, and, with my heart still thumping noisily in my breast, I began to count the tickings; one, two, three, four, five, and so on to a hundred, and from one hundred to many hundreds.
 
Then, out from the confusion of minor noises, a new, arresting sound detached itself. I ceased my counting; no longer I noted the tick-tick of the clock, nor the vague creakings, rustlings and whispers. I saw Smith, shadowly, raise his hand in warning—in needless warning, for I was almost holding my breath in an effort of acute listening.
 
From high up in the house this new sound came from above the topmost room, it seemed, up under the roof; a regular squeaking, oddly familiar, yet elusive. Upon it followed a very soft and muffled thud; then a metallic sound as of a rusty hinge in motion; then a new silence, pregnant with a thousand possibilities more eerie than any clamor.
 
My mind was rapidly at work. Lighting the topmost landing of the house was a sort of glazed trap, evidently set in the floor of a loft-like place extending over the entire building. Somewhere in the red-tiled roof above, there presumably existed a corresponding skylight or lantern.
 
So I argued; and, ere I had come to any proper decision, another sound, more intimate, came to interrupt me.
 
This time I could be in no doubt; some one was lifting the trap above the stairhead—slowly, cautiously, and all but silently. Yet to my ears, attuned to trifling disturbances, the trap creaked and groaned noisily.
 
Nayland Smith waved to me to take a stand on the other side of the opened door—behind it, in fact, where I should be concealed from the view of any one descending the stair.
 
I stood up and crossed the floor to my new post.
 
A dull thud told of the trap fully raised and resting upon some supporting joist. A faint rustling (of discarded garments, I told myself) spoke to my newly awakened, acute perceptions, of the visitor preparing to lower himself to the landing. Followed a groan of woodwork submitted to sudden strain—and the unmistakable pad of bare feet upon the linoleum of the top corridor.
 
I knew now that one of Dr. Fu-Manchu’s uncanny servants had gained the roof of the house by some means, had broken through the skylight and had descended by means of the trap beneath on to the landing.
 
In such a tensed-up state as I cannot describe, nor, at this hour mentally reconstruct, I waited for the creaking of the stairs which should tell of the creature’s descent.
 
I was disappointed. Removed scarce a yard from me as he was, I could hear Nayland Smith’s soft, staccato breathing; but my eyes were all for the darkened hallway, for the smudgy outline of the stair-rail with the faint pat............