Line of Duty

Line of Duty follows D.S. Steve Arnott (Martin Compston), an authorised firearms officer who was transferred to Anti-Corruption Unit 12 (AC-12) after refusing to agree to cover up an unlawful shooting by his own team. At AC-12 Arnott is partnered with D.C. Kate Fleming (Vicky McClure), a highly-commended undercover officer with a keen investigative instinct.