of a motor car at some distance away indicated that it was a loud explosive sound.
âThis fact seemed to be unquestioned.
âBradmoor had been killed by a shot, and the sound of the shot had been heard. Of this we were certain; but that something had leaped off into the water was an evidence more in doubt. We were convinced that the woman had heard the sound of the shot that killed the old Duke,but we were by no means convinced that she had heard a splash in the water. That element of her story seemed always too closely associated with her theoryâthat the whole tragedy was at the hand and instigation of the Devil. Around that idea she presently built up her fantastic explanation.
âWith every interrogation of her, she became more elaborate, more profuse in her details, and more extravagant in her assurance. She had heard the Devil leap into the sea. It was not a heavy splashâsuch as the body of a man would make; it could not have been the body of a man. It was a thin, slight, sharp splash, precisely what the slender body of a Devilâs imp would make as it leaped lightly from the edge of the window into the waterâits pointed feet descending, its arm up.â
Henry Marquis laughed!
âShe had every detail of it now. It must have given her an immense interest in life. Imagine that startling melodrama cutting into the monotony of uneventful days in a padded chair by a window. And from being a neglected and forgotten derelict, she was presently the heroine of a vivid romance, a person of importanceto the countryside. The cottage was crowded, and she had the glory of a story-teller of Bagdad.
âThe result was, of course, that she presently became useless so far as any further inquiry was concerned. That was clear. She was of value to us for two facts onlyâand one of them in doubt. That she had heard the shot was certain. We felt we could depend on that; but the splash was likely fancy. And the more we considered that element of the case, the more we were convinced that this was one of the colored details requisite to her theory.
âThere was no ledge to the window. There was no way in which an assassin could have climbed there in order to leap off into the sea after the crime had been committed. There was no place beyond that window from which the shot could have been fired. There was only the open sea lying beyond it.
âOf course, there were improbabilities suggestedâone of them was that the shot had been fired from the high mast of a sailing ship; but there had been no sailing ship on that afternoon. The officials of the Coast Service were able to assure us of that; they kept a record ofeverything. No sailing ship had been on the open sea on that afternoon inside of this point.
âOf course, we considered everything.
âSome crank sent us an anonymous letter, saying that the shot had been fired from an airplane, or a seaplane; and we looked into that. But there had been no such craft in the neighborhood on that afternoon. So those possibilities were excluded. They were so unlikely that it seemed almost absurd to inquire into them. But when you stop to think about it, they were the only theories that in any way indicated a rational solution of the matter; and that they were not the solution, there was, as it happened, conclusive evidence. There had been no sailing ship, and no aircraft, near the place on that afternoon.â
Marquis paused again. He lighted his cigarette at one of the candles on the table, drew the smoke through it an instant, and then came back to his narrative.
âI have been giving you this case in extended detail,â he said, âbecause I am trying to make you realize the difficulties that it presented, and how carefully those difficulties were considered. I wish you to understand, as we presently cameto understand, how incapable the thing was of any solution. We returned again and again to it, as I have returned here in my