Former detective Ray Lennox is determined to start a new life. He has left Edinburgh Police behind for a fresh career and a fresh relationship in Brighton. Then he meets Mathew Cardingworth. Rich, smooth-talking and immaculately dressed, he is seemingly a pillar of the local community - yet he soon draws Lennox back to a past that he's desperate to forget. As Lennox identifies the links between Cardingworth, a series of violent attacks and the disappearances of a group of foster care boys, he is forced to ask himself: what must he sacrifice to expose the truth?