There came a silence, during which Sanborn had the vaguely uncomfortable feeling that a third presence had somehow entered the room. Mechanically he lit his pipe, and, blowing the first mouthful of smoke upward, he carelessly subjected the ceiling to a covert scrutiny. Nothing doing. He stooped and tapped the bowl of his pipe on an ashtray which rested on a small table. No one on the left hand side of the room. He turned round quickly, ostensibly to adjust a cushion on his easy chair. A flutter of a curtain hanging near the door caught his eye. Then he seated himself and leaned back comfortably.