Second of a three-part thriller. When her detective husband Ryan is murdered, PC Jo Gillespie is expected to leave it to her colleagues in the force to find his killer. With the chief suspect in custody, the investigation into Ryan's murder appears to have been wrapped up. Jo still has doubts and as she digs further into her husband's undercover life, she encounters dark secrets on both sides of the law - leading to a disturbing revelation about the man she married.