A restless Ian Rutledge drives aimlessly, haunted by the past, and narrowly misses a motorcar stopped in the middle of a desolate road. Standing beside the vehicle is a woman with blood on her hands and a dead man at her feet. She swears she didn’t kill Stephen Wentworth. A stranger stepped out in front of their motorcar and fired a single shot before vanishing into the night. Although he is a witness after the fact, Rutledge persuades the Yard to give him the inquiry, since he’s on the scene. But is he seeking justice --- or fleeing painful memories in London? When a second suspicious death occurs, the evidence suggests that a dangerous predator is on the loose, and that death is closer than Rutledge knows.