Axel Petersen's life imploded when his teenage daughter disappeared. Many years later, no one knows where she is or what happened to her. On the twentieth anniversary of his daughter's disappearance, Axel meets a girl on a train. She's almost exactly the same age as his daughter was when she vanished. When they both leave the train at the final stop of a small rural line, he offers her a lift to her holiday cottage. That girl disappears too. With suspicion about his role in the two disappearances now at fever pitch, Axel plunges into the search for this second missing girl, becoming increasingly convinced there's a strong connection between the present-day disappearance and the twenty-year-old mystery. And he's right, although in ways he can hardly begin to imagine...