The hit police corruption drama from the makers of Bodyguard returns. When three police officers are shot dead during the hijack of a seized drugs transport, AC-12 move in to investigate possible police collusion. Stephen Graham stars as John Corbett, the ruthless leader of an Organised Crime Group who hijack a seized drugs transport. AC-12 investigators Superintendent Ted Hastings (Adrian Dunbar), Detective Inspector Kate Fleming (Vicky McClure) and Detective Sergeant Steve Arnott (Martin Compston) suspect corrupt police officers of leaking information. As the body count rises, AC-12 realise they're facing their most vicious adversary yet.