I leapt up in bed with a great start.  
My sleep was troubled often enough in those days which immediately followed our almost miraculous escape from the den of Fu-Manchu; and now, as I crouched there, nerves aquiver—listening—listening—I could not be sure if this dank panic which possessed me had its origin in nightmare or in something else.
 
Surely a scream, a choking cry for help, had reached my ears; but now, almost holding my breath in that sort of nervous tensity peculiar to one aroused thus, I listened, and the silence seemed complete. Perhaps I had been dreaming....
 
"Help! Petrie! Help!..."
 
It was Nayland Smith in the room above me!
 
My doubts were resolved; this was no trick of an imagination disordered. Some dreadful menace threatened my friend. Not delaying even to snatch my dressing-gown, I rushed out on to the landing, up the stairs, bare-footed as I was, threw open the door of Smith's room and literally hurled myself in.
 
Those cries had been the cries of one assailed, had been uttered, I judged, in the brief interval of a life and death struggle; had been choked off....
 
A certain amount of moonlight found access to the room, without spreading so far as the bed in which my friend lay. But at the moment of my headlong entrance, and before I had switched on the light, my gaze automatically was directed to the pale moonbeam streaming through the window and down on to one corner of the sheep skin rug beside the bed.
 
There came a sound of faint and muffled coughing,
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What with my recent awakening and the panic at my heart, I could not claim that my vision was true; but across this moonbeam passed a sort of grey streak, for all the world as though some long thin shape had been withdrawn, snakelike, from the room, through the open window.... From somewhere outside the house, and below, I heard the cough again, followed by a sharp cracking sound like the lashing of a whip.
 
I depressed the switch, flooding the room with light, and as I leapt forward to the bed a word picture of what I had seen formed in my mind; and I found that I was thinking of a grey feather boa.
 
"Smith!" I cried (my voice seemed to pitch itself, unwilled, in a very high key), "Smith, old man!"
 
He made no reply, and a sudden, sorrowful fear clutched at my heart-strings. He was lying half out of bed flat upon his back, his head at a dreadful angle with his body. As I bent over him and seized him by the shoulders, I could see the whites of his eyes. His arms hung limply, and his fingers touched the carpet.
 
"My God!" I whispered, "what has happened?"
 
I heaved him back on to the pillow, and looked anxiously into his face. Habitually gaunt, the flesh so refined away by the consuming nervous energy of the man as to reveal the cheekbones in sharp prominence, he now looked truly ghastly. His skin was so sun-baked as to have changed constitutionally; nothing could ever eradicate that tan. But to-night a fearful greyness was mingled with the brown, his lips were purple ... and there were marks of strangulation upon the lean throat—ever darkening weals of clutching fingers.
 
He began to breathe stertorously and convulsively, inhalation being accompanied by a significant gurgle in the throat. But now my calm was restored in
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face of a situation which called for professional attention.
 
I aided my friend's laboured respirations by the usual means, setting to work vigorously; so that presently he began to clutch at his inflamed throat which that murderous pressure had threatened to close.
 
I could hear sounds of movements about the house, showing that not I alone had been awakened by those hoarse screams.
 
"It's all right, old man," I said, bending over him: "brace up!"
 
He opened his eyes—they looked bleared and bloodshot—and gave me a quick glance of recognition.
 
"It's all right, Smith!" I said—"no! don't sit up; lie there for a moment."
 
I ran across to the dressing-table, whereon I perceived his flask to lie, and mixed him a weak stimulant with which I returned to the bed.
 
As I bent over him again, my housekeeper appeared in the doorway, pale and wide-eyed.
 
"There is no occasion for alarm," I said over my shoulder; "Mr. Smith's nerves are overwrought and he was awakened by some disturbing dream. You can return to bed, Mrs. Newsome."
 
Nayland Smith seemed to experience much difficulty in swallowing the contents of the tumbler which I held to his lips; and, from the way in which he fingered the swollen glands, I could see that his throat, which I had vigorously massaged, was occasioning him great pain. But the danger was past, and already that glassy look was disappearing from his eyes, nor did they protrude so unnaturally.
 
"God, Petrie!" he whispered, "that was a near shave! I haven't the strength of a kitten!"
 
"The weakness will pass off," I replied; "there will be no collapse, now. A little more fresh air...."
 
I stood up, glancing at the windows, then back
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at Smith, who forced a wry smile in answer to my look.
 
"Couldn't be done, Petrie," he said huskily.
 
His words referred to the state of the windows. Although the night was oppressively hot, these were only opened some four inches at top and bottom. Farther opening was impossible because of iron brackets screwed firmly into the casements, which prevented the windows being raised or lowered farther.
 
It was a precaution adopted after long experience of the servants of Dr. Fu-Manchu.
 
Now, as I stood looking from the half-strangled man upon the bed to those screwed-up windows, the fact came home to my mind that this precaution had proved futile. I thought of the thing which I had likened to a feather boa; and I looked at the swollen weals made by clutching fingers upon the throat of Nayland Smith.
 
The bed stood fully four feet from the nearest window.
 
I suppose the question was written in my face; for, as I turned again to Smith, who, having struggled upright, was still fingering his injured throat ruefully—"God only knows, Petrie!" he said; "no human arm could have reached me...."
 
For us, the night was ended so far as sleep was concerned. Arrayed in his dressing-gown, Smith sat in the white cane chair in my study with a glass of brandy and water beside him, and (despite my official prohibition) with the cracked briar, which had sent up its incense in many strange and dark places of the East and which yet survived to perfume these prosy rooms in suburban London, between his teeth. I stood with my elbow resting upon the mantelpiece looking down at him where he sat.
 
"By God! Petrie," he said, yet again, with his fingers straying gently over the surface of his throat, "that was a narrow shave—a damned narrow shave!"
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"Narrower than perhaps you appreciate, old man," I replied. "You were a most unusual shade of blue when I found you...."
 
"I managed," said Smith evenly, "to tear those clutching fingers away for a moment and to give a cry for help. It was only for a moment, though. Petrie! they were fingers of steel—of steel!"
 
"The bed...." I began.
 
"I know that," rapped Smith. "I shouldn't have been sleeping in it, had it been within reach of the window; but, knowing that the Doctor avoids noisy methods, I had thought myself fairly safe so long as I made it impossible for any one actually to enter the room...."
 
"I have alw............