When a counterterrorism raid goes tragically wrong, DS Steve Arnott refuses to participate in a cover-up. Ostracised by colleagues, he transfers to an anti-corruption unit led by Supt. Ted Hastings. He soon finds his target is the city's top detective, DCI Tony Gates. with whom he must engage in a cat-and-mouse struggle to uncover Gates' secret.

Line of Duty Season 1 Episodes...

• s01e01 - Series 1, Episode 1
• s01e02 - Series 1, Episode 2
• s01e03 - Series 1, Episode 3
• s01e04 - Series 1, Episode 4
• s01e05 - Series 1, Episode 5

Line of Duty Show Summary

Steve Arnott is a young officer who's fallen foul of his superiors for refusing to help in the cover-up of an operation that ended in the shooting of an innocent father. He seems ideal to join AC-12, an anti-corruption police unit, just as it starts to investigate Detective Chief Inspector Tony Gates, the regional force's Officer of the Year.