The detective advanced and knelt beside the crumpled-up figure on the ground. He examined it briefly, and then stood up.

"The fact that he had the missing pigtail in his pocket," he said, "is proof enough to my mind that he did the murder."

"And to mine."

"There's another point," he added, "which throws a lot of light on the matter. You and Mr. Harley were out of town at the time of the Huang Chow case; but the Chief and I outlined it, you remember, one night in Mr. Harley's rooms?"

"I remember it perfectly; the giant spider in the coffin------"

"Yes; and a certain Ah Fu, confidential servant of the old man, who used to buy the birds the thing fed on. Well, Mr. Knox, Huang Chow was the biggest dealer in illicit stuff in all the East End--and this battered thing at our feet is--Ah Fu!"

"Huang Chow's servant?"

"Exactly!"

I stared, uncomprehendingly, and:

"In what way does this throw light on the matter?" I asked.

Durham--a very intelligent young officer--smiled significantly.

"I begin to see light!" he declared. "The gentleman who made off just as I arrived on the scene probably had a private quarrel with the Chinaman and was otherwise not concerned in any way."

"I am disposed to agree with you," I said guardedly.

"Of course, you've no idea of his ident.i.ty?"

"I'm afraid not."

"We may find him," mused the officer, glancing at me shrewdly, "by applying at the offices of the Planet Line, but I rather doubt it. Also I rather doubt if we'll look very far. He's saved us a lot of trouble, but"--peering about in the shadowy corners which abounded--"didn't I see somebody else lurking around here?"

"I'm almost certain there was someone else!" I cried. "In fact, I could all but swear to it."

"H'm!" said the detective. "He's not here now. Might I trouble you to walk along to Limehouse Police Station for the ambulance? I'd better stay here."

I agreed at once, and started off.

Thus a second time my plans were interrupted, for my expedition that night ultimately led me to Bow Street, whence, after certain formalities had been observed, I departed for my chambers, the mysterious pigtail in my pocket. Failing the presence of Durham, the pigtail must have been retained as evidence, but:

"We shall know where to find it if it's wanted, Mr. Knox," said the Yard man, "and I can trust you to look after your own property."

The clock of St. Paul's was chiming the hour of two when I locked the door of my chambers and prepared to turn in. The clangour of the final strokes yet vibrated through the night's silence when someone set my own door bell loudly ringing.

With an exclamation of annoyance I shot back the bolts and threw open the door.

A Chinaman stood outside upon the mat!

IV

HOW IT ALL ENDED

"Me wishee see you," said the apparition, smiling blandly; "me comee in?"

"Come in, by all means," I said without enthusiasm, and, switching on the light in my study, I admitted the Chinaman and stood facing him with an expression upon my face which I doubt not was the reverse of agreeable.

My visitor, who wore a slop-shop suit, also wore a wide-brimmed bowler hat; now, the set bland smile still upon his yellow face, he removed the bowler and pointed significantly to his skull.

His pigtail had been severed some three inches from the root!

"You gotchee my pigtail," he explained; "me callee get it--thank you."

"Thank you," I said grimly. "But I must ask you to establish your claim rather more firmly."

"Yessir," agreed the Chinaman.

And thereupon in tolerable pidgin English he unfolded his tale. He proclaimed his name to be Hi Wing Ho, and his profession that of a sailor, or so I understood him. While ash.o.r.e at Suez he had become embroiled with some drunken seamen: knives had been drawn, and in the scuffle by some strange accident his pigtail had been severed. He had escaped from the conflict, badly frightened, and had run a great distance before he realized his loss. Since Southern Chinamen of his particular Tong hold their pigtails in the highest regard, he had inst.i.tuted inquiries as soon as possible, and had presently learned from a Chinese member of the crew of the S.S. Jupiter that the precious queue had fallen into the hands of a fireman on that vessel. He (Hi Wing Ho) had shipped on the first available steamer bound for England, having in the meanwhile communicated with his friend on the Jupiter respecting the recovery of the pigtail.

"What was the name of your friend on the Jupiter?"

"Him Li Ping--yessir!"--without the least hesitation or hurry.

I nodded. "Go on," I said.

He arrived at the London docks very shortly after the Jupiter. Indeed, the crew of the latter vessel had not yet been paid off when Hi Wing Ho presented himself at the dock gates. He admitted that, finding the fireman so obdurate, he and his friend Li Ping had resorted to violence, but he did not seem to recognize me as the person who had frustrated their designs. Thus far I found his story credible enough, excepting the accidental severing of the pigtail at Suez, but now it became wildly improbable, for he would have me believe that Li Ping, or Ah Fu, obtaining possession of the pigtail (in what manner Hi Wing Ho protested that he knew not) he sought to hold it to ransom, knowing how highly Hi Wing Ho valued it.

I glared sternly at the Chinaman, but his impa.s.sive countenance served him well. That he was lying to me I no longer doubted; for Ah Fu could not have hoped to secure such a price as would justify his committing murder; furthermore, the presence of the unfortunate Jewess in the case was not accounted for by the ingenious narrative of Hi Wing Ho. I was standing staring at him and wondering what course to adopt, when yet again my restless door-bell clamoured in the silence.

Hi Wing Ho started nervously, exhibiting the first symptoms of alarm which I had perceived in him. My mind was made up in an instant. I took my revolver from the drawer and covered him.

"Be good enough to open the door, Hi Wing Ho," I said coldly.

He shrank from me, pouring forth voluble protestations.

"Open the door!"

I clenched my left fist and advanced upon him. He scuttled away with his odd Chinese gait and threw open the door. Standing before me I saw my friend Detective Sergeant Durham, and with him a remarkably tall and very large-boned man whose square-jawed face was deeply tanned and whose aspect was dourly Scottish.

When the piercing eyes of this stranger rested upon Hi Wing Ho an expression which I shall never forget entered into them; an expression coldly murderous. As for the Chinaman, he literally crumpled up.

"You rat!" roared the stranger.

Taking one long stride he stooped upon the Chinaman, seized him by the back of the neck as a terrier might seize a rat, and lifted him to his feet.