When a man is spotted bound to the tracks, the tranquil nostalgia of the North Norfolk Railway is shattered. To add to the disquiet, while the police are investigating the kidnapping, another man is found dead on a steam train. A pattern of fear is emerging on the Poppy Line and the pressure is on DI Ashley Knight's struggling team to deliver answers. With the body count rising along the once peaceful Norfolk line, Knight must find a way to stop a killer before they reach their final destination. Because Ashley knows if she doesn't, for someone it's the end of the line.