“I thought, sir, my case was over when I had cleared up the matter of the bank notes passed to Messrs. Cook in London,” French declared as he accepted a cigarette from the other’s case, “but one or two rather strange points have made me form a tentative theory which seems sufficiently probable to need going into. In short——” and he explained with business-like brevity his ideas about Roper with the facts from which they had sprung. The Chief Constable was profoundly impressed by the recital, much more so than French would have believed possible. “It’s a likely enough theory,” he admitted. “Your arguments seem unanswerable and I certainly agree that the idea is sufficiently promising to warrant investigation.” “I’m glad, sir, that you think so. In my job, as you know, there is always the danger of being carried away by some theory that appeals because of its ingenuity, while overlooking some more commonplace explanation that is much more likely to be true.” “I know that, and this may of course be an instance. I am glad, however, that you mentioned your theory to me. It is an idea which should be kept secret, and I shall set inquiries on foot without giving away the Starvel connection.” “Then, sir, you can’t recall any disappearances about the time?” “I can’t. And I don’t expect we shall find any. Do you?” “Well, I was in hope that we might.” Major Valentine shook his head. “No, Inspector; there I think you’re wrong,” he said with decision. “If Roper really carried out these crimes, he’s far too clever to leave an obvious trail of that kind. We may be sure that if he inveigled some third person to the house and murdered him, a satisfactory explanation of the victim’s absence was provided. You suggested it yourself in your statement. The man will ostensibly have left his surroundings, never to return. If he was a native he will have gone to America or some other distant place. If he was a visitor he will have left to return home. Somehow matters will have been arranged so that he will disappear without raising suspicion. Don’t you think so?” “Yes, sir, I certainly do. But it’s going to make it a hard job to trace him.” “I know it is. If he lived in a large town it will be so hard that we probably shan’t succeed, but if he came from the country or a village the local men should have the information.” “That is so, sir. Then I may leave the matter in your hands?” “Yes, I’ll attend to it. By the way, where are you staying?”