Line of Duty

1. S01E01A Disastrous AffairJune 26, 2012 7.5When Steve Arnott is transferred to a police anti-corruption unit, he finds his target is the city's top detective, Tony Gates. Can Gates re
2. S01E02The AssaultJuly 3, 2012 7.8Having 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 sec
3. S01E03In the TrapJuly 10, 2012 7.9Arnott is convinced Gates played a part in Jackie's disappearance. With Fleming's help, the anti-corruption team tries to trap Gates into re
4. S01E04TerrorJuly 17, 2012 8.0Desperate for proof of Gates's corruption, Fleming pushes her relationship with him to the limit. But her behaviour causes Morton to questio
5. S01E05Season's bestThe ProbationJuly 24, 2012 8.2With Gates on the run, the anti-corruption team come under pressure to close the case once and for all. Arnott is forced to make some tough

Season 1 ranked & reviewed

1. S02E01Episode 1February 12, 2014 7.4A brutal ambush on a police convoy leaves three officers dead and a protected witness fighting for his life. AC-12 turn their spotlight on L
2. S02E02Episode 2February 19, 2014 7.3Following the tragedy at the hospital, AC12's Kate Fleming is planted undercover in Lindsay Denton's Missing Persons Unit. But Lindsay in tu
3. S02E03Episode 3February 26, 2014 7.2Lindsay is denied bail and finds herself targeted in prison. Growing increasingly desperate, she tells Kate about a relationship with an exe
4. S02E04Season's bestEpisode 4March 5, 2014 7.8Following the violent attack she suffered in prison, Lindsay is granted special dispensation to visit her dying mother. Meanwhile, deputy ch
5. S02E05Episode 5March 12, 2014 7.8Lindsay fights for her life as troubling details emerge of a vicious conspiracy involving corrupt police officers. With growing evidence of
6. S02E06Episode 6March 19, 2014 7.6AC12's investigation finally exposes a vicious criminal gang run from within the police. But while Steve now appears convinced of Lindsay's

Season 2 ranked & reviewed

1. S03E01Episode 1March 24, 2016 7.6A hardened criminal is shot dead by an armed-response unit led by Sgt Danny Waldron, who claims they were acting in self-defence. But when A
2. S03E02Episode 2March 31, 2016 7.6The shooting at the drugs house intensifies the scrutiny on Danny's team, who once again close ranks. But with DC Kate Fleming on the inside
3. S03E03Episode 3April 7, 2016 7.7Undeterred by recent events, DS Steve Arnott continues to find crucial evidence in the Danny Waldron case, and when his theory is confirmed
4. S03E04Episode 4April 14, 2016 7.9Fresh testimony launches AC-12 back on the trail of the Caddy, a corrupt officer with links to organized crime. But new disturbing evidence
5. S03E05Episode 5April 21, 2016 7.8Following new evidence obtained by DC Kate Fleming, the former Head of Vice Patrick Fairbank is questioned by AC-12, but despite Kate's best
6. S03E06Season's bestEpisode 6April 28, 2016 8.1DS Steve Arnott is arrested on suspicion of murder but continues to protest his innocence. Does DC Kate Fleming's undercover operation hold

Season 3 ranked & reviewed

1. S04E01Episode 1March 26, 2017 8.1After months of hunting a serial killer, DCI Roz Huntley faces intense pressure to apprehend a suspect. Michael Farmer is caught and charged
2. S04E02Episode 2April 2, 2017 8.0A dismembered body is discovered, and worries grow when Roz fails to report for duty. After further questioning of Michael Farmer unearths c
3. S04E03Season's bestEpisode 3April 9, 2017 8.2As shocking new evidence is unearthed, AC-12 step up their investigation in to the case against Michael Farmer. Could the real killer still
4. S04E04Episode 4April 16, 2017 8.2Roz's husband Nick is brought in for questioning by AC-12. But while Nick denies any involvement in Steve's attack, his suspicions about Roz
5. S04E05Episode 5April 23, 2017 8.1AC-12's future hangs in the balance, after Hilton bars them from investigating Roz Huntley. But Roz's problems are building closer to home.
6. S04E06Episode 6April 30, 2017 8.1The explosive series finale pits AC-12 against Roz in a climactic duel to find Tim's murderer and unmask Balaclava Man.

Season 4 ranked & reviewed

1. S05E01Episode 1March 31, 2019 8.1Following the deadly hijack of a police convoy, AC-12 target a ruthless organised crime group known to have links with corrupt officers.
2. S05E02Episode 2April 7, 2019 7.9A fresh police leak enables another audacious raid, Arnott's attempts to gather information put him in a dangerous situation, and the team t
3. S05E03Episode 3April 14, 2019 8.1Corbett's most daring plan yet requires McQueen to exploit links with corrupt police officers. AC-12 make a shocking discovery.
4. S05E04Season's bestEpisode 4April 21, 2019 8.5Tensions rise in the OCG following the events at Eastfield. With troubling questions hanging over the identity of 'H', suspicions mount at A
5. S05E05Episode 5April 28, 2019 7.7As the hunt for 'H' intensifies, Steve and Kate wonder if Hastings is guarding a dark secret.
6. S05E06Episode 6May 5, 2019 8.0In a nail-biting finale, closely guarded secrets are revealed.Carmichael's dogged interrogation of Hastings presents mounting evidence of su

Season 5 ranked & reviewed

1. S06E01Episode 1March 21, 2021 8.2When new information comes to light about a possible suspect in a year-long unsolved murder investigation, DCI Joanne Davidson appears keen
2. S06E02Episode 2March 28, 2021 8.2Having opened an official inquiry into DCI Jo Davidson and Operation Lighthouse, AC-12 begin to suspect a cover up. Steve and Chloe dig into
3. S06E03Season's bestEpisode 3April 4, 2021 8.7On the strength of evidence from a new witness, DCI Jo Davidson brings Terry Boyle back in for questioning about Gail Vella's murder. Kate i
4. S06E04Episode 4April 11, 2021 8.6DCI Jo Davidson faces increasing pressure from all sides as AC-12 make major breakthroughs in the investigation.Hastings acknowledges that t
5. S06E05Episode 5April 18, 2021 8.5AC-12 link Gail Vella's murder with a historic case of police corruption, and Kate hatches a plan to tell once and for all if Jo is bent.The
6. S06E06Episode 6April 25, 2021 8.6As AC-12 struggle to deal with the repercussions of tragic events, Hastings makes one final bid to uncover institutionalised corruption befo
7. S06E07Episode 7May 2, 2021 8.1With time running out, AC-12 attempt to unmask 'H', the Fourth Man (or Woman) commanding the network of corrupt officers behind the murder o

Season 6 ranked & reviewed