replied. I staked all on that sureness, though logically—— But I would not let my mind wander to any other deduction than the one to which, for better or worse, I pinned my faith. "We had the letting of a furnished apartment in the Alhambra, as the house is named, put into our hands three years ago on the 30th of last month," said the youth, referring to a book. "To my certain knowledge no other furnished one was to be had in the street at that time, and there hasn't been since. Isn't likely to be either, so far as I can see. That was the grand chance. German-American lady and gentleman, Mr. and Mrs. Maurice Lowenstein, going unexpectedly to Europe, and glad to get rid of their apartment to a good tenant at a nominal price." "You found the good tenant?" I asked. "We did, sir—or the tenant found us. Wanted a furnished apartment, not too large or expensive, in a quiet street, quietness the great consideration. Above all, the proprietors mustn't want to use the place again for at least five years. That just fitted in, because our clients were anxious to let for seven years; the husband had a business opening in Hamburg. The new tenant took the place for that period; and as there's a long time to run yet, I shouldn't have thought there was much hope for you. However, your friend may have private information." "Does the new tenant live there altogether?" I wanted to know. "Only comes up from the country occasionally. Expensive fad, to rent a New York apartment that way. But what's money for? Some people have it to burn." "Quite so," I admitted. "Have you ever met the tenant?" "Only once—when the apartment was engaged; fixed up in one interview. The rent comes through the post." "It must be the apartment my friend talked about!" I exclaimed. "Can't be any other. Is the name of your friend's friend Paulling?" "Why, yes, I have the impression of something like that. By the way, I might be able to find an old photograph, to make quite sure. Would you recognise it?" "I might—and I mightn't. Three years is a long time." "Well, I'll do my best through some acquaintances," I finished. "If we're speaking of the same person, you may be able to introduce me and save the