Catch up with Line of Duty episode 5 via BBC iPlayer for the next 30 days.

AC-12’s loyalties are divided when DS Steve Arnott comes under scrutiny from his colleagues. With his career in jeopardy, Arnott turns to an unlikely source for help.

Episode 6 (the series 3 finale) airs Thursday 28 April at 9PM on BBC Two. Get a sneak peek here.

Episode one
Episode two
Episode three
Episode four