In the middle of the night in Kinloch, the phone rings. Detective Sergeant Brian Scott answers. It's a message from his old friend and partner, DCI Jim Daley, which chills him to the bone: 'She's dead, Brian. I couldn't take it anymore - I killed her! You have to help.' Daley has been arrested for murder, and everyone saw him do it. The police have all the evidence they need to put him behind bars for life, but Scott still believes he's innocent. Is someone trying to frame him? The search for answers takes Daley and Scott on a dark journey into their past, putting the people closest to them in immediate danger.