A motorway service station on the M1: dimly lit run down poorly supervised flickering lights dark corners; a favourite stopover for long-distance lorry drivers on their way up north from London. Behind it a body is found in a ditch that of a girl barely out of her teens. She appears to have no family no friends no connections anywhere. Other girls have gone missing in the vicinity & no one has stepped forward to claim them. Anna Travis is assigned to the case. Her blood runs cold when she receives a letter from a lifer -- someone she was responsible for arresting in the past -- who writes to her from prison asking her to visit him urgently. For he claims he knows who the killer is...