"And then, when I had got to that state of readiness for anything, I made something of a discovery. It was about one in the morning, and I was walking slowly 'round the castle, keeping in the soft grass. I had come under the shadow of the East Front, and far above me, I could hear the vile, hooning whistle of the Room, up in the darkness of the unlit wing. Then, suddenly, a little in front of me, I heard a man's voice, speaking low, but evidently in glee:-- "'By George! You Chaps; but I wouldn't care to bring a wife home in that!' it said, in the tone of the cultured Irish. "Someone started to reply; but there came a sharp exclamation, and then a rush, and I heard footsteps running in all directions. Evidently, the men had spotted me. "For a few seconds, I stood there, feeling an awful ass. After all, _they_ were at the bottom of the haunting! Do you see what a big fool it made me seem? I had no doubt but that they were some of Tassoc's rivals; and here I had been feeling in every bone that I had hit a real, bad, genuine Case! And then, you know, there came the memory of hundreds of details, that made me just as much in doubt again. Anyway, whether it was natural, or ab-natural, there was a great deal yet to be cleared up. "I told Tassoc, next morning, what I had discovered, and through the whole of every night, for five nights, we kept a close watch 'round the East Wing; but there was never a sign of anyone prowling about; and all the time, almost from evening to dawn, that grotesque whistling would hoon incredibly, far above us in the darkness. "On the morning after the fifth night, I received a wire from here, which brought me home by the next boat. I explained to Tassoc that I was simply bound to come away for a few days; but told him to keep up the watch 'round the castle. One thing I was very careful to do, and that was to make him absolutely promise never to go into the Room, between sunset and sunrise. I made it clear to him that we knew nothing definite yet, one way or the other; and if the room were what I had first thought it to be, it might be a lot better for him to die first, than enter it after dark.