III

In moments of crisis the human mind can become extraordinarily efficient. Before the bell was silent in the basement, the mind of Stephen Byrne, kneeling in a sweat by the dead body of a housemaid, had covered a vast field of circumstance and performed two or three distinct logical processes. His first instinct was to put out the light. With that person peering on the doorstep the light in the hall had better be out. He felt exposed, naked, illuminated. On the other hand, one could see practically nothing through the frosted glass from outside, only the shadow of anyone actually moving in the hall. That he knew from experience. Probably the person⁠—whoever it was⁠—could see nothing that was on the floor, nothing that was below the level of his or her interfering eye. If Stephen stayed still as he was, the person might never know he was there, might even go away in disgust. To put the light out would be a gratuitous advertisement that somebody was in the house. Besides, it would look so rude.