could not remember. He was maddened by one of those half-memories that make a man feel half-witted. Surely he had heard that strange, swift walking somewhere. Suddenly he sprang to his feet with a new idea in his head, and walked to the door. His room had no direct outlet on the passage, but let on one side into the glass office, and on the other into the cloak room beyond. He tried the door into the office, and found it locked. Then he looked at the window, now a square pane full of purple cloud cleft by livid sunset, and for an instant he smelt evil as a dog smells rats.
The rational part of him (whether the wiser or not) regained its supremacy. He remembered that the proprietor had told him that he should lock the door, and would come later to release him. He told himself that twenty things he had not thought of might explain the eccentric sounds outside; he reminded himself that there was just enough light left to finish his own proper work. Bringing his paper to the window so as to catch the last stormy evening light, he resolutely plunged once more into the almost completed record. He had written for about twenty minutes, bending closer and closer to his paper in the lessening light; then suddenly he sat upright. He had heard the strange feet once more.
This time they had a third oddity. Previously the unknown man had walked, with levity indeed and lightning quickness, but he had walked. This time he ran. One could hear the swift, soft, bounding steps coming along the corridor, like the pads of a fleeing and leaping panther. Whoever was coming was a very strong, active man, in still yet tearing excitement. Yet, when the sound had swept up to the office like a sort of whispering whirlwind, it suddenly changed again to the old slow, swaggering stamp.
Father Brown flung down his paper, and, knowing the office door to be locked, went at once into the cloak room on the other side. The