Line of Duty

#1 - Episode 1

Season 1 - Episode 1

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.

#2 - Episode 2

Season 2 - Episode 2

Following the tragedy at the hospital, AC12's Kate Fleming is planted undercover in Lindsay Denton's Missing Persons Unit. But Lindsay in turn gathers compromising evidence against the anti-corruption team.

#3 - Episode 5

Season 1 - Episode 5

Gates goes on the run, convinced he can save his career and marriage by proving his innocence. As his options dwindle, the anti-corruption team faces renewed pressure to close the case, but rifts start to appear when Arnott questions how far Fleming is willing to go to get results.

#4 - Episode 3

Season 1 - Episode 3

Arnott is convinced Gates played a part in Jackie's disappearance. With Fleming's help, the anti-corruption team tries to trap Gates into revealing his involvement in covering up Jackie's crimes.

#5 - Episode 4

Season 2 - Episode 4

Following the violent attack she suffered in prison, Lindsay is granted special dispensation to visit her dying mother. DCC Dryden shrugs off allegations about his relationship with Lindsay and possible links to the ambush.

#6 - Episode 4

Season 4 - Episode 4

#7 - Episode 4 8.05

Season 1 - Episode 4

Desperate for proof of Gates's corruption, Fleming pushes her relationship with him to the limit, but her behaviour causes Morton to question her loyalty.

#8 - Episode 2 7.96

Season 1 - Episode 2

Having been duped into covering up Jackie's crime, Gates is desperate to sever ties with her. But, as Arnott and Fleming close in on his secret, Gates is plunged into an even more dangerous situation than he first thought.

#9 - Episode 2

Season 3 - Episode 2

The shooting at the drugs house intensifies the scrutiny on Danny Waldron's armed-response unit, who once again close ranks. But with Kate Fleming on the inside, AC-12 feed in new information that helps her expose cracks in the team's story, while Steve Arnott looks deeper into the suspect sergeant's background and makes a shocking discovery. However, the anti-corruption cop's life is complicated by an investigation into his own past conduct.

#10 - Episode 6

Season 2 - Episode 6

AC12's investigation finally exposes a vicious criminal gang run from within the police. But while Steve now appears convinced of Lindsay's innocence, Kate remains determined to prove she had a role in the ambush.

#11 - Episode 1 8.11

Season 2 - Episode 1

A brutal ambush on a police convoy leaves three officers dead and a protected witness fighting for his life. AC-12 turns its spotlight on Lindsay Denton, the officer who led the convoy but escaped unscathed.

#12 - Episode 6 8.89

Season 3 - 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?

#13 - Episode 5

Season 3 - Episode 5

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.

#14 - Episode 3

Season 3 - Episode 3

DS Steve Arnott believes there is a dark secret in Danny Waldron's past. But while DI Cottan is commended for cracking the Waldron case, the spotlight falls on Arnott's questionable conduct in a previous enquiry.