I have said that my wrists were manacled behind me, the manacles being attached to a chain fastened in the wall. I now contrived, with extreme difficulty, to reverse the position of my hands; that is to say, I climbed backward through the loop formed by my fettered arms, so that instead of the gyves being behind me, they now were in front. Then I began to examine them, learning, as I had anticipated, that they fastened with a lock. I sat gazing at the steel bracelets in the light of the lamp which swung over my head, and it became apparent to me that I had gained little by my contortion. A slight noise disturbed these unpleasant reveries. It was nothing less than the rattling of keys! For a moment I wondered if I had heard aright, or if the sound portended the coming of some servant of the Doctor who was locking up the establishment for the night. The jangling sound was repeated, and in such a way that I could not suppose it to be accidental. Some one was deliberately rattling a small bunch of keys in an adjoining room. And now my heart leapt wildly--then seemed to stand still. With a low whistling cry a little grey shape shot through the doorway by which Fu-Manchu had retired, and rolled like a ball of fluff blown by the wind, completely under the table which bore the weird scientific appliances of the Chinaman; the advent of the grey object was accompanied by a further rattling of keys. My fear left me, and a mighty anxiety took its place. This creature which now crouched chattering at me from beneath the big table was Fu-Manchu's marmoset, and in the intervals of its chatterings and grimacing, it nibbled, speculatively, at the keys upon the ring which it clutched in its tiny hands. Key after key it sampled in this manner, evincing a growing dissatisfaction with the uncrackable nature of its find. One of those keys might be that of the handcuffs! I could not believe that the tortures of Tantalus were greater than were mine at this moment. In all my hopes of rescue or release, I had included nothing so strange, so improbable as this. A sort of awe possessed me; for if by this means the key which should release me should come into my possession, how ever again could I doubt a beneficent Providence? But they were not yet in my possession; moreover, the key of the handcuffs might not be amongst the bunch. Were there no means whereby I could induce the marmoset to approach me?