Flying Squad officers Detective Inspector Jack Regan (Ray Winstone) and Detective Constable George Carter (Plan B (musician)) arrive at the scene of a warehouse robbery; four armed men are attempting to steal gold bars. After Regan and Carter capture the robbers, Regan takes some of the gold bars to give to his informant Harry (Alan Ford (actor)). Detective Chief Inspector Ivan Lewis (Steven Mackintosh) from Internal affairs (law enforcement) starts to scrutinise Regan's activities, unaware that Regan is having an affair with his estranged wife, Flying Squad officer Nancy Lewis (Hayley Atwell).