After DS Steve Arnott (Martin Compston) refuses to lie under oath and gets transferred to an Anti-Corruption Unit 12 (AC-12), he is partnered with a highly-commended undercover officer who has impressive investigative instinct, DC Kate Fleming (Vicky McClure). They are supervised by Superintendent Ted Hastings (Adrian Dunbar), who is a senior investigating officer working on uncovering dirty corruption within the police force.
Hastings has doubts about DCI Anthony "Tony" Gates (Lennie James) who has a suspiciously high clearance rate at CID's TO-20.
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