Club DJ Richard Martin is run off the road and subsequently shot in the head, leaving the perpetrators to dispose of his body and his car, as well as the gun used in the shooting. When the gun turns up in the bedroom of Erin Doyle, the daughter of Banks' long-term neighbours, Banks decides to act quietly to remove the gun without fuss. However, DI Morton overrules him, forcing him to follow procedure, organizing a full-blown raid which results in Erin's father, Peter Doyle, being tasered resulting in a heart attack. As Banks, Blackstone and Lang investigate Martin's death, Annie is forced to conduct an official investigation into Helen's actions, an investigation which threatens to destroy Banks' team. As the team identify Jaff Kitson as the possible murderer, Erin reveals that Jaff's new girlfriend is none other than Banks' daughter, Tracy. Banks has to decide between his family loyalties, his moral actions and the hope of a relationship with Annie in order to secure the safety of his daughter. But which will he choose?