which had been put upon it was one that could not be opened without the key. He returned then to the room he himself occupied and, carefully locking himself in, opened the window.
This window, though it was on the top floor of the house, was still some ten feet below the top of the flat brick wall that formed the parapet of the roof, and Max saw that the roof could not be reached from it. He therefore looked across to the wall of the next house, which, being exactly like its neighbor, had here at the rear a wall of rough brick, straight and parallel with that of the house he was in. The second wall was barely three feet from him—not too far for even a small man, who had been accustomed to making his way up chimney crevasses in mountain-climbing, to reach with
