Line Of Duty: Season 3, Episode 6

3 - 6: Episode 6

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? AC-12 legal counsel Gill Biggeloe pressurises Superintendent Ted Hastings but some new evidence leaves the enquiry turning on its head.