'Let me see,' he said at last, 'we were at the inquest, weren't we? No, we had done with that. Ah, I remember. I was telling you that on the whole I had been successful in my inquiries, investigation, or whatever you like to call it, into the matter. Wasn't that where I left off?' 'Yes, that was it. To be precise, I think "though" was the last word you said on the matter.' 'Exactly. I have been thinking it all over since the other night, and I have come to the conclusion that that "though" is a very big "though" indeed. Not to put too fine a point on it, I have had to confess that what I found out, or thought I found out, amounts in reality to nothing. I am as far away from the heart of the case as ever. However, I may as well tell you what I do know. You may remember my saying that I was impressed a good deal by some remarks of one of the doctors who gave evidence at the inquest. Well, I determined that my first step must be to try if I could get something more definite and intelligible out of that doctor. Somehow or other I managed to get an introduction to the man, and he gave me an appointment to come and see him. He turned out to be a pleasant, genial fellow; rather young and not in the least like the typical medical man, and he began the conference by offering me whisky and cigars. I didn't think it worth while to beat about the bush, so I began by saying that part of his evidence at the Harlesden Inquest struck me as very peculiar, and I gave him the printed report, with the sentences in question underlined. He just glanced at the slip, and gave me a queer look. "It struck you as peculiar, did it?" said he. "Well, you must remember that the Harlesden case was very peculiar. In fact, I think I may safely say that in some features it was unique--quite unique." "Quite so," I replied, "and that's exactly why it interests me, and why I want to know more about it. And I thought that if anybody could give me any information it would be you. What is your opinion of the matter?" 'It was a pretty downright sort of question, and my doctor looked rather taken aback. '"Well," he said, "as I fancy your motive in inquiring into the question must be mere curiosity, I think I may tell you my opinion with tolerable freedom. So, Mr., Mr. Dyson? if you want to know my theory, it is this: I believe that Dr. Black killed his wife." '"But the verdict," I answered, "the verdict was given from your own evidence." '"Quite so; the verdict was given in accordance with the evidence of my colleague and myself, and, under the circumstances, I think the jury acted very sensibly. In fact, I don't see what else they could have done. But I stick to my opinion, mind you, and I say this also. I don't wonder at Black's doing what I firmly believe he did. I think he was justified."