3x1 - London Kills

After off-duty police officer Sgt. Ian Durrant finds a dead man at the wheel of his van, the detectives link the victim to a woman who was killed while in police custody. As DC Rob Brady was the one who discovered her dead, the case affects him deeply. When Trainee DC Billie Fitzgerald finds a connection to a murdered young cop, DI David Bradford suspects the killer could be a police officer.