CHAPTER XI

/Mr. Reeder/ closed the door, put on the lights, and set himself to unravel the inexplicable mystery of its opening. Before he went to bed he had shot home the bolt, had turned the key in the lock, and the key was still on the inside. It struck him, as he turned it, that he had never heard a lock that moved so silently, or a bolt that slipped so easily into its groove. Both lock and bolt had been recently oiled. He began a scrutiny of the inside face of the door, and found a simple solution of the somewhat baffling…