The end of that little passage leading from the Duke's apartments to the watching figure was wrapped in gloom. The faint creaking which had first attracted my attention might have come from an unseen door there, or it might have been the not unnatural creaking of timbers in an old house. The sound, however, was followed by a strange vision. I saw an arm stretched out from the shadows, linger for a moment over the tumbler, and then disappear. I rubbed my eyes. Was this Faraday and his toy magic, or reality? I waited. It might have been ten minutes before the next happening. The watcher in the chair stretched out his arm, lifted the tumbler to his lips and drank. After that there was silence again. Then from the spot where the arm had come, a figure dressed in black stole out, the figure of a man of medium height, without betraying collar or shirt front, black as a bat save for the pale blur of an indistinguishable face, and noiseless. He stooped over the custodian, now evidently either asleep or unconscious. In a moment or two he stood upright, paused before the door of the jewel chamber, and with a curious, apparently effortless movement, passed through it. Then it seemed to me that my time had come for action. I stole quietly down the few stairs, unfastened the door of the gallery, and crept up the corridor. The door of the jewel chamber was ajar, and through it I could see the shining of the electric light inside, a glimmer of which fell upon the face of the drugged custodian. Suddenly, upon the very threshold of the jewel chamber, I stopped short. All my wariness was gone, lost in a shock of surprise. A little exclamation broke from my lips. The next second I found myself struggling for my life. The walls swam round. I raised my voice and gave a great cry. After that there was silence. At twelve o'clock the next morning, with a bandage around my head, and feeling still the effects of an almost delirious night, I stepped into the car which was waiting to take us to the station. The Duke, who was practising at the cricket nets, came hurrying across to us, his bat still in his hand. "I had no idea that you were going by this early train!" he exclaimed. "So glad that I did not miss you altogether." Rose murmured something polite, and Leonard said a word or two about the pleasure of our stay. I remained silent. "I am afraid," our host continued, smiling at me, "that I was a little unsympathetic in the small hours of the morning. I am never at my best when I am roused from sleep. However, you must let me express my regrets to you now, Mr. Lister, for your little accident. At the same time," he went on, "I am sure you will agree with me that the neighbourhood of the jewel chamber is rather a dangerous place for a man addicted to nightmares to be wandering about at three o'clock in the morning." I looked the Duke in the face.