"I _am_ tired, though," he said, "a little. But I've got a fool brain that won't let my body go to sleep so long as there is work to be done. Then, as soon as everything is finished, the brain lets go and the body sleeps like a log. Now I knew I couldn't go to sleep properly to-night until I had heard the very interesting theory you are going to confide to me. Besides, I have a thing or two to tell you." "Go ahead," I said. "We had a cable from our Paris office just before I left. It seems that M. Théophile d'Aurelle plays the fiddle in the orchestra of the Café de Paris. He played as usual to-night, so that it is manifestly impossible that he should also be lying in the New York morgue. Moreover, none of his friends, so far as he knows, is in America. No doubt he may be able to identify the photograph of the dead man, and we've already started one on the way, but we can't hear from it for six or eight days. But my guess was right--the fellow's name isn't d'Aurelle." "You say you have a photograph?" "Yes, I had some taken of the body this afternoon. Here's one of them. Keep it; you may have a use for it." I took the card, and, as I gazed at the face depicted upon it, I realised that the distorted countenance I had seen in the afternoon had given me no idea of the man's appearance. Now the eyes were closed and the features composed and peaceful, but even death failed to give them any dignity. It was a weak and dissipated face, the face of a hanger-on of cafés, as Parks had said--of a loiterer along the boulevards, of a man without ambition, and capable of any depth of meanness and deceit. At least, that is how I read it. "He's evidently low-class," said Godfrey, watching me. "One of those parasites, without work and without income, so common in Paris. Shop-girls and ladies' maids have a weakness for them." "I think you are right," I agreed; "but, at the same time, if he was of that type, I don't see what business he could have had with Philip Vantine." "Neither do I; but there are a lot of other things I don't see, either. We're all in the dark, Lester; have you thought of that? Absolutely in the dark." "Yes, I have thought of it," I said, slowly. "No doubt we can establish this fellow's identity in time--sooner than we think, perhaps, for most of the morning papers will run his picture, and if he is known here in New York at all, it will be recognised by some one. When we find out who he is, we can probably guess at the nature of his business with Vantine. We can find out who the woman was who called to see Vantine to-night--that is just a case of grilling Rogers; then we can run her down and get her secret out of her. We can find why Rogers is trying to shield her. All that is comparatively simple. But when we have done it all, when we have all these facts in hand, I am afraid we shall find that they are utterly unimportant." "Unimportant?" I echoed. "But surely--"