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 m.u.f.fled coughing.

What with my recent awakening and the panic at my heart, I could not claim that my vision was true; but across this moonbeam pa.s.sed a sort of gray streak, for all the world as though some long thin shape had been withdrawn, snakelike, from the room, through the open window...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 leaped 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 gray 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 G.o.d!" I whispered--"what has happened?"

I heaved him back onto 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 sunbaked as to have changed const.i.tutionally; nothing could ever eradicate that tan. But to-night a fearful grayness was mingled with the brown, his lips were purple... and there were marks of strangulation upon the lean throat--ever darkening weals made by clutching fingers.

He began to breathe stentoriously and convulsively, inhalation being accompanied by a significant gurgling in the throat. But now my calm was restored in face of a situation which called for professional attention.

I aided my friend's labored 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 movement about the house, showing that not I alone had been awakened by those hoa.r.s.e 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 ma.s.saged, was occasioning him great pain. But the danger was past, and already that gla.s.sy look was disappearing from his eyes, nor did they protrude so unnaturally.

"G.o.d, Petrie!" he whispered, "that was a near shave! I haven't the strength of a kitten!"

"The weakness will pa.s.s off," I replied; "there will be no collapse, now. A little more fresh air..."

I stood up, glancing at the windows, then back 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. Further opening was impossible because of iron brackets screwed firmly into the cas.e.m.e.nts which prevented the windows being raised or lowered further.

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:

"G.o.d 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 gla.s.s 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, steaming between his teeth. I stood with my elbow resting upon the mantelpiece looking down at him where he sat.

"By G.o.d! Petrie," he said, yet again, with his fingers straying gently over the surface of his throat, "that was a narrow shave--a d.a.m.ned narrow shave!"

"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 always insisted, Smith," I cried, "that there was danger! What of poisoned darts? What of the d.a.m.nable reptiles and insects which form part of the armory of Fu-Manchu?"

"Familiarity breeds contempt, I suppose," he replied. "But as it happened none of those agents was employed. The very menace that I sought to avoid reached me somehow. It would almost seem that Dr.

Fu-Manchu deliberately accepted the challenge of those screwed-up windows! Hang it all, Petrie! one cannot sleep in a room hermetically sealed, in weather like this! It's positively Burmese; and although I can stand tropical heat, curiously enough the heat of London gets me down almost immediately."

"The humidity; that's easily understood. But you'll have to put up with it in the future. After nightfall our windows must be closed entirely, Smith."

Nayland Smith knocked out his pipe upon the side of the fireplace. The bowl sizzled furiously, but without delay he stuffed broad-cut mixture into the hot pipe, dropping a liberal quant.i.ty upon the carpet during the process. He raised his eyes to me, and his face was very grim.

"Petrie," he said, striking a match on the heel of his slipper, "the resources of Dr. Fu-Manchu are by no means exhausted. Before we quit this room it is up to us to come to a decision upon a certain point." He got his pipe well alight. "What kind of thing, what unnatural, distorted creature, laid hands upon my throat to-night? I owe my life, primarily, to you, old man, but, secondarily, to the fact that I was awakened, just before the attack--by the creature's coughing--by its vile, high-pitched coughing..."

I glanced around at the books upon my shelves. Often enough, following some outrage by the brilliant Chinese doctor whose genius was directed to the discovery of new and unique death agents, we had obtained a clue in those works of a scientific nature which bulk largely in the library of a medical man. There are creatures, there are drugs, which, ordinarily innocuous, may be so employed as to become inimical to human life; and in the distorting of nature, in the disturbing of balances and the diverting of beneficent forces into strange and dangerous channels, Dr. Fu-Manchu excelled. I had known him to enlarge, by artificial culture, a minute species of fungus so as to render it a powerful agent capable of attacking man; his knowledge of venomous insects has probably never been paralleled in the history of the world; whilst, in the sphere of pure toxicology, he had, and has, no rival; the Borgias were children by comparison. But, look where I would, think how I might, no adequate explanation of this latest outrage seemed possible along normal lines.

"There's the clue," said Nayland Smith, pointing to a little ash-tray upon the table near by. "Follow it if you can."

But I could not.

"As I have explained," continued my friend, "I was awakened by a sound of coughing; then came a death grip on my throat, and instinctively my hands shot out in search of my attacker. I could not reach him; my hands came in contact with nothing palpable. Therefore I clutched at the fingers which were dug into my windpipe, and found them to be small--as the marks show--and hairy. I managed to give that first cry for help, then with all my strength I tried to unfasten the grip that was throttling the life out of me. At last I contrived to move one of the hands, and I called out again, though not so loudly. Then both the hands were back again; I was weakening; but I clawed like a madman at the thin, hairy arms of the strangling thing, and with a blood-red mist dancing before my eyes, I seemed to be whirling madly round and round until all became a blank. Evidently I used my nails pretty freely--and there's the trophy."

For the twentieth time, I should think, I carried the ash-tray in my hand and laid it immediately under the table-lamp in order to examine its contents. In the little bra.s.s bowl lay a blood-stained fragment of grayish hair attached to a tatter of skin. This fragment of epidermis had an odd bluish tinge, and the attached hair was much darker at the roots than elsewhere. Saving its singular color, it might have been torn from the forearm of a very hirsute human; but although my thoughts wandered unfettered, north, south, east and west; although, knowing the resources of Fu-Manchu, I considered all the recognized Mongolian types, and, in quest of hirsute mankind, even roamed far north among the blubbering Esquimo; although I glanced at Australasia, at Central Africa, and pa.s.sed in mental review the dark places of the Congo, nowhere in the known world, nowhere in the history of the human species, could I come upon a type of man answering to the description suggested by our strange clue.

Nayland Smith was watching me curiously as I bent over the little bra.s.s ash-tray.

"You are puzzled," he rapped in his short way.

"So am I--utterly puzzled. Fu-Manchu's gallery of monstrosities clearly has become reinforced; for even if we identified the type, we should not be in sight of our explanation."

"You mean," I began...

"Fully four feet from the window, Petrie, and that window but a few inches open! Look"--he bent forward, resting his chest against the table, and stretched out his hand toward me. "You have a rule there; just measure."