Catch up with Line of Duty episode 6 via BBC iPlayer for the next 30 days.
DS Steve Arnott is arrested on suspicion of murder but continues to protest his innocence. Does DC Kate Fleming’s undercover operation hold the key to Steve’s guilt and the identity of the Caddy?
Episode one
Episode two
Episode three
Episode four
Episode five
Follow Daniel Mays on Twitter @DanielMays9