"On the contrary, he told me rather more than I expected," was the answer. "Evidently he had a purpose in wanting his wife to wear the diamonds. It is fairly clear, I think, that he did not believe she had parted with the necklace, therefore his purpose had to do with some one who would be at the reception that night. Jacob Hartmann seems to fit that part. It is wonderful, Wigan, what a lot of trouble is caused when a person tells only half the truth." "I can understand Lord Leconbridge's reticence," I said. "Yes. As a fact, I wasn't thinking of Lord Leconbridge just at the moment. My present difficulty is to decide which road to take. One is easy, the other difficult. Let us get into this taxi. How true it is that the longest way round is often the shortest road home." He told the man to drive to Old Broad Street. "A theory may lead to disaster, professor," I said. "Ah! but we are going into the city to look for facts. I have noticed, Wigan, that lately you have become strangely susceptible to beauty." I wondered if he had guessed that I was in love with Zena. "If you refer to Lady Leconbridge----" "I don't. I speak in the abstract. Still, there exists a certain amount of evidence against her, and your refusal to admit it has warped your judgment in this case, I fancy. Do you know Jacob Hartmann?" "No." "A very pleasant man, I am told. We are going to see him, so shall be able to judge for ourselves. You must question; I am merely your assistant. Your line is this: You have got Lord and Lady Leconbridge's story, and you are not quite satisfied. You recognize that the affair is a delicate one, but you are not going to wink at the compounding of a felony to hush up a family scandal." All the way to the city Quarles continued to coach me, giving me certain points and questions which I was to lead up to gradually. I understood why he had warned me against susceptibility to beauty, for the whole trend of these questions was toward damning Lady Leconbridge. Mr. Hartmann received us in his private room, and, although reluctant to talk about an affair which was no business of his, was willing to give any help in his power. I repeated the story as Lord Leconbridge had first told it to me, just the bare facts, and I dwelt upon the delicacy of the affair. "You did not actually see the necklace, I suppose?" "No; and in the excitement I was not presented to Lady Leconbridge," Hartmann answered. "Was she very much agitated?" I asked. "She was curiously calm." "I believe you know something about precious stones, Mr. Hartmann?" "Gems are a hobby of mine," he said with a smile. "I want your opinion. Do you think paste might deceive an expert?" "At a casual glance--yes, if it were good paste." "For instance," I said, "if Lady Leconbridge had been wearing the necklace when you approached her would you have known had it been paste?" "I should," he answered, with a satisfied smile.