“The driver stated she came from your chambers, for you saw her off, and her last words to you were 'Good night, Mr. Knox, I am sincerely sorry to have given you all this trouble.' Is that correct, sir?” The constable, who had read out the information in an official voice, now looked at me, as I stood there stupefied. “It is,” I said blankly. “I'll come at once.” It would seem that I had misjudged my unfortunate visitor: her story of the yellow man on the stair had apparently been not a fabrication, but a gruesome fact! III HOW I REGAINED IT My ghastly duty was performed; I had identified the dreadful thing, which less than an hour before had been a strikingly beautiful woman, as my mysterious visitor. The police were palpably disappointed at the sparsity of my knowledge respecting her. In fact, had it not chanced that Detective Sergeant Durham was in the station, I think they would have doubted the accuracy of my story. As a man of some experience in such matters, I fully recognized its improbability, but beyond relating the circumstances leading up to my possession of the pigtail and the events which had ensued, I could do no more in the matter. The weird relic had not been found on the dead woman, nor in the cab. Now the unsavoury business was finished, and I walked along Bow Street, racking my mind for the master-key to this mystery in which I was become enmeshed. How I longed to rush off to Harley's rooms in Chancery Lane and to tell him the whole story! But my friend was a thousand miles away--and I had to see the thing out alone. That the pigtail was some sacred relic stolen from a Chinese temple and sought for by its fanatical custodians was a theory which persistently intruded itself. But I could find no place in that hypothesis for the beautiful Jewess; and that she was intimately concerned I did not doubt. A cool survey of the facts rendered it fairly evident that it was she and none other who had stolen the pigtail from my rooms. Some third party--possibly the “yellow man” of whom she had spoken--had in turn stolen it from her, strangling her in the process. The police theory of the murder (and I was prepared to accept it) was that the assassin had been crouching in hiding behind or beside the cab--or even within the dark interior. He had leaped in and attacked the woman at the moment that the taxi-man had started his engine; if already inside, the deed had proven even easier. Then, during some block in the traffic, he had slipped out unseen, leaving the body of the victim to be discovered when the cab pulled up at the hotel.