Crime thriller following one multi-stranded inquiry over five hours. DS Steve Arnott is transferred to a police anti-corruption unit and assigned to investigate senior officer DCI Tony Gates. Not only is his target one of the most popular cops on the force, but his squad has returned the best crime figures for three consecutive years. Surely no one can be that good? Arnott soon finds himself in a cat-and-mouse struggle as he slowly unearths his superior's secrets. Lennie James, Martin Compston, Vicky McClure, Gina McKee and Neil Morrissey star.