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 service in the house by the waterside, and they knew nothing whatever of his private affairs.

By the next day I had, except for a slight headache, completely recovered from the effects of Poirot’s gas bomb. We went down together to Chinatown and searched the house from which I had been rescued. The premises consisted of two ramshackle houses joined together by an underground passage. The ground floors and the upper stories of each were unfurnished and deserted, the broken windows covered by decaying shutters. Japp had already been prying about in the cellars, and had discovered the secret of the entrance to the subterranean chamber where I had spent such an unpleasant half-hour. Closer investigation confirmed the impression that he had made on me the night before. The silks on the walls and divan and the carpets on the floors were of exquisite workmanship. Although I know very little about Chinese art, I could appreciate that every article in the room was perfect of its kind.

With the aid of Japp and some of his men we conducted a most thorough search of the apartment. I had cherished high hopes that we would find documents of importance. A list, perhaps, of some of the more important agents of the Big Four, or cipher notes of some of their plans, but