When two bogus social workers come to Katy Heath's house and take her son away, Banks is drawn into a massive search for the boy - but is Katy telling the truth?

An 11-year old's body is found and Banks wonders if there is a connection between his death and Kyle's disappearance.

Banks races to locate a mysterious recording that appears to connect Jack Barber and the members of The Crystal Kiss together.

The discovery of a gun in the bedroom of a neighbour sees Banks involved in an internal investigation which could break up the team.

While Helen's career hangs in the balance, Banks risks everything to rescue his daughter who has been taken hostage by Jaff Kitson.