"For a very good reason, Petrie, and the same that prompts me to retain the Tlun-Nr box in my own possession rather than to deposit it in the strong-room of my bank."

"I begin to understand."

"I trust you do, Petrie; it is fairly obvious. Probably the plan is a perilous one, but I hope, by laying myself open to attack, to apprehend the enemy--perhaps to make an important capture."

Setting down my gla.s.s, I stared in silence at Smith.

"I will antic.i.p.ate your remark," he said, smiling dryly. "I am aware that I am not ent.i.tled to expose _you_ to these dangers. It is _my_ duty and I must perform it as best I can; you, as a volunteer, are perfectly ent.i.tled to withdraw."

As I continued silently to stare at him, his expression changed; the gray eyes grew less steely, and presently, clapping his hand upon my shoulder in his impulsive way--

"Petrie!" he cried, "you know I had no intention of hurting your feelings, but in the circ.u.mstances it was impossible for me to say less."

"You have said enough, Smith," I replied shortly. "I beg of you to say no more."

He gripped my shoulder hard, then plunged his hand into his pocket and pulled out the blackened pipe.

"We see it through together, then, though G.o.d knows whither it will lead us."

"In the first place," I interrupted, "since you have left the chest unguarded----"

"I locked the door."

"What is a mere lock where Fu-Manchu is concerned?"

Nayland Smith laughed almost gaily.

"Really, Petrie," he cried, "sometimes I cannot believe that you mean me to take you seriously. Inspector Weymouth has engaged the room immediately facing our door, and no one can enter or leave the suite unseen by him."

"Inspector Weymouth?"

"Oh! for once he has stooped to a disguise: spectacles, and a m.u.f.fler which covers his face right up to the tip of his nose. Add to this a prodigious overcoat and an asthmatic cough, and you have a picture of Mr. Jonathan Martin, the occupant of room No. 239."

I could not repress a smile upon hearing this description.

"No. 239," continued Smith, "contains two beds, and Mr. Martin's friend will be joining him there this evening."

Meeting my friend's questioning glance, I nodded comprehendingly.

"Then what part do _I_ play?"

"Ostensibly we both leave town this evening," he explained; "but I have a scheme whereby you will be enabled to remain behind. We shall thus have one watcher inside and two out."

"It seems almost absurd," I said incredulously, "to expect any member of the Yellow group to attempt anything in a huge hotel like the New Louvre, here in the heart of London!"

Nayland Smith, having lighted his pipe, stretched his arms and stared me straight in the face.

"Has Fu-Manchu never attempted outrage, murder, in the heart of London before?" he snapped.

The words were sufficient. Remembering black episodes of the past (one at least of them had occurred not a thousand yards from the very spot upon which we now stood), I knew that I had spoken folly.

Certain arrangements were made then, including a visit to Scotland Yard; and a plan--though it sounds anomalous--at once elaborate and simple, was put into execution in the dusk of the evening.

London remained in the grip of fog, and when we pa.s.sed along the corridor communicating with our apartments, faint streaks of yellow vapor showed in the light of the lamp suspended at the further end.

I knew that Nayland Smith suspected the presence of some spying contrivance in our rooms, although I was unable to conjecture how this could have been managed without the connivance of the management. In pursuance of his idea, however, he extinguished the lights a moment before we actually quitted the suite. Just within the door he helped me to remove the somewhat conspicuous check traveling-coat which I wore. With this upon his arm he opened the door and stepped out into the corridor.

As the door slammed upon his exit, I heard him cry: "Come along, Petrie! we have barely five minutes to catch our train."

Detective Carter of New Scotland Yard had joined him at the threshold, and m.u.f.fled up in the gray traveling-coat was now hurrying with Smith along the corridor and out of the hotel. Carter, in build and features, was not unlike me, and I did not doubt that any one who might be spying upon our movements would be deceived by this device.

In the darkness of the apartment I stood listening to the retreating footsteps in the corridor. A sense of loneliness and danger a.s.sailed me. I knew that Inspector Weymouth was watching and listening from the room immediately opposite; that he held Smith's key; that I could summon him to my a.s.sistance, if necessary, in a matter of seconds.

Yet, contemplating the vigil that lay before me in silence and darkness, I cannot pretend that my frame of mind was buoyant. I could not smoke; I must make no sound.

As pre-arranged, I cautiously removed my boots, and as cautiously tiptoed across the carpet and seated myself in an arm-chair. I determined there to await the arrival of Mr. Jonathan Martin's friend, which I knew could not now be long delayed.

The clocks were striking eleven when he arrived, and in the perfect stillness of that upper corridor. I heard the bustle which heralded his approach, heard the rap upon the door opposite, followed by a m.u.f.fled "Come in" from Weymouth. Then, as the door was opened, I heard the sound of a wheezy cough.

A strange cracked voice (which, nevertheless, I recognized for Smith's) cried, "Hullo, Martin!--cough no better?"

Upon that the door was closed again, and as the retreating footsteps of the servant died away, complete silence--that peculiar silence which comes with fog--descended once more upon the upper part of the New Louvre Hotel.

CHAPTER XII

THE VISITANT

That first hour of watching, waiting, and listening in the lonely quietude pa.s.sed drearily; and with the pa.s.sage of every quarter-- signalized by London's m.u.f.fled clocks--my mood became increasingly morbid. I peopled the silent rooms opening out of that wherein I sat, with stealthy, murderous figures; my imagination painted hideous yellow faces upon the draperies, twitching yellow hands protruding from this crevice and that. A score of times I started nervously, thinking I heard the pad of bare feet upon the floor behind me, the suppressed breathing of some deathly approach.

Since nothing occurred to justify these tremors, this apprehensive mood pa.s.sed; I realized that I was growing cramped and stiff, that unconsciously I had been sitting with my muscles nervously tensed.

The window was open a foot or so at the top and the blind was drawn; but so accustomed were my eyes now to peering through the darkness, that I could plainly discern the yellow oblong of the window, and though very vaguely, some of the appointments of the room--the Chesterfield against one wall, the lamp-shade above my head, the table with the Tlun-Nr box upon it.

There was fog in the room, and it was growing damply chill, for we had extinguished the electric heater some hours before. Very few sounds penetrated from outside. Twice or perhaps thrice people pa.s.sed along the corridor, going to their rooms; but, as I knew, the greater number of the rooms along that corridor were unoccupied.

From the Embankment far below me, and from the river, faint noises came at long intervals it is true; the m.u.f.fled hooting of motors, and yet fainter ringing of bells. Fog signals boomed distantly, and train whistles shrieked, remote and unreal. I determined to enter my bedroom, and, risking any sound which I might make, to lie down upon the bed.

I rose carefully and carried this plan into execution. I would have given much for a smoke, although my throat was parched; and almost any drink would have been nectar. But although my hopes (or my fears) of an intruder had left me, I determined to stick to the rules of the game as laid down. Therefore I neither smoked nor drank, but carefully extended my weary limbs upon the coverlet, and telling myself that I could guard our strange treasure as well from there as from elsewhere ... slipped off into a profound sleep.

Nothing approaching in acute and sustained horror to the moment when next I opened my eyes exists in all my memories of those days.

In the first place I was aroused by the shaking of the bed. It was quivering beneath me as though an earthquake disturbed the very foundations of the building. I sprang upright and into full consciousness of my lapse.... My hands clutching the coverlet on either side of me, I sat staring, staring, staring ... at _that_ which peered at me over the foot of the bed.

I knew that I had slept at my post; I was convinced that I was now widely awake; yet I _dared_ not admit to myself that what I saw was other than a product of my imagination. I dared not admit the physical quivering of the bed, for I could not, with sanity, believe its cause to be anything human. But what I saw, yet could not credit seeing, was this:

A ghostly white face, which seemed to glisten in some faint reflected light from the sitting-room beyond, peered over the bedrail; gibbered at me demoniacally. With quivering hands this night-mare horror, which had intruded where I believed human intrusion to be all but impossible, clutched the bed-posts so that the frame of the structure shook and faintly rattled....