Chapter 7 We followed Mrs. Haberhorn to the door and through it she pointed to a man, smiling blandly at us from his chair in the outer room. He was the missing Doctor Humphrey Maskell. In spite of the grimly controlled expression on the face of my chief, I knew in-stinctively that Thatcher Colt was taken by surprise, almost as much as I. Not for a moment had I suspected that the "laughing physician of Washington Square" had returned to New York. Apparently Doctor Maskell did not realise the seriousness of the identification just made of him by his landlady. "Good evening, Mrs. Haberhorn," he said urbanely. "You seemed as if you did not want to recognise me when you passed me going in just now." "I shall want to talk with you in just a minute, Doctor," said Thatcher Colt. "I felt su

