Chapter 17 HE HAD had problems equally insoluble, but they had never before kept him awake at night. He dozed heavily and wakened, twisted growlingly in his bed, and was on the point of sleeping when again he wakened. He thought he had heard a noise outside his window. He got out of bed, threw up the lower sash of the window and looked out. It was a clear, cold night of stars, and he was looking down into the small garden at the back of the house. 'Garden' was a complimentary term for a grass-grown square of microscopic size, with a narrow flower bed running under the walls. He found it more than a little chilly, dressed as he was in his thin sleeping suit, and he was on the point of withdrawal when he saw, or imagined he saw, a figure glide from the shadow of the wall, cross the tiny la