Hewitt's tale was simple enough. He had endued himself in somewhat seedy clothes, and had visited 37 Raven Street, Blackfriars, which he found to be merely a tenement house. It took some time to make inquiries there, with the necessary caution, because of the number of lodgers; and then the inquiries led to nothing. It was an experience common enough in his practice, but none the less an annoying delay, and when he returned to his office he found Mr. Peytral already awaiting him. Peytral described his following of Mayes at much greater length and detail than before, and he and Hewitt had come on to Norbury Row at once and asked news of Mr. Moon. Mr. Moon's description of the successive disappearances of Plummer and myself, and of our continued absence, so aroused Hewitt's suspicions that he instantly procured help from the nearest station, and approached the door of Mayes's office. A knock being unanswered, the door was instantly broken in. The room was found to be unoccupied, but the ladder was still standing at the open window, by which Mayes had descended to the back premises. Down this ladder Hewitt went, with the police after him. The rest I had seen myself. "But what," I said, "what is this mystery? Why did Telfer give up the code, and what is the power that Mayes talks of?" "It is a power," replied Hewitt, "that I have suspected for some time, and now I am quite sure of it. A secret, dangerous and terrible power which I have encountered before, though never before have I known its possibilities carried so far. It is hypnotism!" "Hypnotism!" I exclaimed. "But can a person be hypnotised against his will?" "In a sense, in most cases, he cannot. That is the explanation of Mayes's proposals to you to go through a 'form of initiation.' If you had consented, the 'form' would have been a process of hypnotism. Once or twice repeated, and you would have been wholly under his control, so that if he willed it and forbade you, you could tell nothing of what he wished kept secret, and you would have committed any crime he might suggest. Consider poor Jacob Mason! Remember how he struggled to tell what he knew, oppressed by the horror of it, and how it all ended! And remember Henning the clerk, Mayes's tool in that case of bond robbery! What has happened to him? He committed suicide, as you know, immediately after Mayes had left him at the barn. Brett, this power of hypnotism, a power for healing in the hands of a good man, may become a terrible power for evil in the hands of a villain!" "But Telfer, to-day? He seems to have known nothing of Mayes, and he was not one of his regular creatures--Mayes himself told me so."