“But I have omitted the case of Martin, upon which I rather pride myself. Put yourself in my position, Dr. Priestley. Here was a man, living in the suburbs, and having an office in the City. How was I to lure him to Praed Street, and ensure his death when he arrived there, at a time when Praed Street had already gained notoriety as the scene of three mysterious deaths? I knew quite a lot about Martin, more than most people, in fact. I knew that he had once been in business in Praed Street, and that he had prospered there rather more rapidly than his apparent business warranted. My connection among the shadier classes in the neighbourhood helped me there. I discovered, hint by hint, that he was a well-known fence, a receiver of stolen goods, that is, Dr. Priestley, and that discovery, coupled with the fact that the premises he had once occupied were again changing hands, gave me an idea.