"Karamaneh!" snapped Smith. "I don't know what you mean in the least, but she came here--knowing this to be my present address--to ask me to protect her from a mysterious man who had followed her right from Charing Cross. She said he was down in the lobby, and naturally, I asked her to wait here whilst I went and sent him about his business." He laughed shortly. "I am over-old," he said, "to be guyed by a woman. You spoke just now of someone called Fu-Manchu. Is that the crook I'm indebted to for the loss of my plans? I've had attempts made by agents of two European governments, but a Chinaman is a novelty." "This Chinaman," Smith assured him, "is the greatest novelty of his age. You recognize your symptoms now from Bayard Taylor's account?" "Mr. West's statement," I said, "ran closely parallel with portions of Moreau's book on 'Hashish Hallucinations.' Only Fu-Manchu, I think, would have thought of employing Indian hemp. I doubt, though, if it was pure Cannabis indica. At any rate, it acted as an opiate--" "And drugged Mr. West," interrupted Smith, "sufficiently to enable Fu-Manchu to enter unobserved." "Whilst it produced symptoms which rendered him an easy subject for the Doctor's influence. It is difficult in this case to separate hallucination from reality, but I think, Mr. West, that Fu-Manchu must have exercised an hypnotic influence upon your drugged brain. We have evidence that he dragged from you the secret of the combination." "God knows we have!" said West. "But who is this Fu-Manchu, and how--how in the name of wonder did he get into my chambers?" Smith pulled out his watch. "That," he said rapidly, "I cannot delay to explain if I'm to intercept the man who has the plans. Come along, Petrie; we must be at Tilbury within the hour. There is just a bare chance." CHAPTER XX IT was with my mind in a condition of unique perplexity that I hurried with Nayland Smith into the cab which waited and dashed off through the streets in which the busy life of London just stirred into being. I suppose I need not say that I could penetrate no farther into this, Fu-Manchu's latest plot, than the drugging of Norris West with hashish? Of his having been so drugged with Indian hemp--that is, converted temporarily into a maniac--would have been evident to any medical man who had heard his statement and noted the distressing after-effects which conclusively pointed to Indian hemp poisoning. Knowing something of the Chinese doctor's powers, I could understand that he might have extracted from West the secret of the combination by sheer force of will whilst the American was under the influence of the drug. But I could not understand how Fu-Manchu had gained access to locked chambers on the third story of a building. "Smith," I said, "those bird tracks on the window-sill--they furnish the key to a mystery which is puzzling me."