The BEST Episodes of Line of Duty

Every episode ever - ranked by fan votes!

Last Updated: Apr 3, 2021

Network: BBC One

A drama about the investigations of AC-12, a controversial police anticorruption unit.


#1 - Breach

Season 3 - Episode 6 - Aired Apr 28, 2016

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?

star 8.63
1,552 votes
Directors: John Strickland
Writers: Jed Mercurio
The List

#2 - The List

Season 3 - Episode 5 - Aired Apr 21, 2016

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.

star 8.35
1,513 votes
Directors: John Strickland
Writers: Jed Mercurio
Royal Hunting Ground

#3 - Royal Hunting Ground

Season 4 - Episode 6 - Aired Apr 30, 2017

While Nick Huntley faces lengthy questioning, AC-12 remain convinced of Roz's involvement.

star 8.29
1,329 votes
Directors: John Strickland
Writers: Jed Mercurio
Episode 6

#4 - Episode 6

Season 5 - Episode 6 - Aired May 5, 2019

In a nail-biting 90-minute finale, Hastings's secrets are laid bare. Will 'H' be revealed at last?

star 8.22
632 votes
Episode 2

#5 - Episode 2

Season 6 - Episode 2 - Aired Mar 28, 2021

Having opened an official inquiry into DCI Jo Davidson and Operation Lighthouse, AC-12 begin to suspect a cover up. Steve and Chloe dig into Gail Vella’s controversial reporting for clues to her murder, and find links to previous AC-12 cases. Their investigation takes a shocking turn when they begin to scrutinise Jo's personal life.

star 8.15
173 votes
Directors: Daniel Nettheim
Writers: Jed Mercurio
Episode 4

#6 - Episode 4

Season 5 - Episode 4 - Aired Apr 21, 2019

Tensions rise in the OCG following the events at Eastfield. With troubling questions hanging over the identity of ‘H’, suspicions mount at AC-12.

star 8.15
664 votes
Directors: John Strickland
Writers: Jed Mercurio
 In the Trap

#7 - In the Trap

Season 4 - Episode 3 - Aired Apr 9, 2017

As AC-12 wrestle with the new forensic evidence casting doubt over Tim Ifield, Kate is approached by another woman claiming to have been assaulted by Michael Farmer. While Steve fumes over this contradictory testimony, Kate uses her newfound respect to inveigle herself with the Trapdoor team. Meanwhile, Steve challenges Roz's husband Nick to vouch for his wife's whereabouts on the night Tim Ifield went missing. With Nick proving evasive, Steve senses a whole new angle on the investigation.

star 8.12
1,366 votes
Directors: John Strickland
Writers: Jed Mercurio
Last Words

#8 - Last Words

Season 2 - Episode 5 - Aired Mar 12, 2014

Lindsay fights for her life as troubling details emerge of a vicious conspiracy involving corrupt police officers. With growing evidence of links between DCC Dryden and the ambush, Hastings is under pressure to arrest his senior officer.

star 8.08
1,280 votes
Directors: Daniel Nettheim
Writers: Jed Mercurio
Lying Nest

#9 - Lying Nest

Season 4 - Episode 5 - Aired Apr 23, 2017

DCI Roz Huntley struggles to allay her husband's suspicions. AC-12 find a new angle to pursue their case against her.

star 8.07
1,306 votes
Directors: John Strickland
Writers: Jed Mercurio
Episode 5

#10 - Episode 5

Season 5 - Episode 5 - Aired Apr 28, 2019

As the hunt for 'H' intensifies, Steve and Kate wonder if Hastings is guarding a dark secret.

star 8.06
639 votes
Episode 2

#11 - Episode 2

Season 5 - Episode 2 - Aired Apr 7, 2019

Kate and Steve attempt to track down a lead. A fresh police leak enables another audacious raid. Steve’s attempts to gather information put him in a dangerous situation.

star 8.02
689 votes
Directors: John Strickland
Writers: Jed Mercurio
Moral Superiority

#12 - Moral Superiority

Season 4 - Episode 4 - Aired Apr 16, 2017

Roz'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 mount. Meanwhile, AC-12 discover new anomalies in the forensic evidence and issue DCI Roz Huntley with a second Reg 15 notice. AC-12's case appears watertight until Roz starts dismantling their evidence with inside information of her own.

star 8.02
1,361 votes
Directors: John Strickland
Writers: Jed Mercurio
Blood Money

#13 - Blood Money

Season 2 - Episode 4 - Aired Mar 5, 2014

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

star 8.01
1,263 votes
Directors: Daniel Nettheim
Writers: Jed Mercurio
The Caddy

#14 - The Caddy

Season 2 - Episode 6 - Aired Mar 19, 2014

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.

star 7.99
1,213 votes
Directors: Daniel Nettheim
Writers: Jed Mercurio
Episode 3

#15 - Episode 3

Season 5 - Episode 3 - Aired Apr 14, 2019

Corbett’s most daring plan yet requires McQueen to exploit links with corrupt police officers. AC-12 make a shocking discovery.

star 7.98
695 votes
Directors: John Strickland
Writers: Jed Mercurio
The Probation

#16 - The Probation

Season 1 - Episode 5 - Aired Jul 24, 2012

With 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 decisions about where his loyalties lie. Fleming and Hastings go all out to catch Gates, leading to a shattering conclusion.

star 7.98
1,525 votes
Writers: Jed Mercurio
Episode 1

#17 - Episode 1

Season 5 - Episode 1 - Aired Mar 31, 2019

Following the deadly hijack of a police convoy, AC-12 target a ruthless organised crime group known to have links with corrupt officers.

star 7.96
713 votes
Directors: John Strickland
Writers: Jed Mercurio
The Ambush

#18 - The Ambush

Season 2 - Episode 1 - Aired Feb 12, 2014

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

star 7.96
1,453 votes
Writers: Jed Mercurio
Negative Pressure

#19 - Negative Pressure

Season 3 - Episode 4 - Aired Apr 14, 2016

Fresh testimony launches AC-12 back on the trail of the Caddy, a corrupt officer with links to organised crime. But new disturbing evidence suggests the Caddy may reside within AC-12.

star 7.96
1,458 votes
Directors: John Strickland
Writers: Jed Mercurio
In the Shadow of the Truth

#20 - In the Shadow of the Truth

Season 4 - Episode 1 - Aired Mar 26, 2017

DCI Roz Huntley is under intense pressure from her superiors to apprehend a serial murderer after months of fruitless investigation. When another young woman is abducted, Roz is on the scene to track down and charge a 24-year-old man. But doubts around the young man's guilt lead the chief forensic investigator to ask AC-12 to investigate. Is Roz ignoring forensic evidence that might prove the young man's innocence? AC-12's Supt Hastings places DS Kate Fleming undercover inside Roz's team to dig deeper into the case. With DS Steve Arnott piling on pressure from the outside, Roz is forced to act decisively. A mother of two and wife to Nick, Roz will do anything to stop her life from unravelling.

star 7.96
1,538 votes
Directors: Jed Mercurio
Writers: Jed Mercurio

#21 - Monsters

Season 3 - Episode 1 - Aired Mar 24, 2016

Police anti-corruption unit AC12 return for another investigation. Sergeant Danny Waldron and his armed response team shoot dead a hardened criminal, but cracks soon appear in their story. Are they hiding a cold-blooded murder?

star 7.95
1,543 votes
Directors: Michael Keillor
Writers: Jed Mercurio
Snake Pit

#22 - Snake Pit

Season 3 - Episode 3 - Aired Apr 7, 2016

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.

star 7.91
1,439 votes
Directors: Michael Keillor
Writers: Jed Mercurio
Who Sows the Wind

#23 - Who Sows the Wind

Season 4 - Episode 2 - Aired Apr 2, 2017

A dismembered body is discovered, and worries grow when DCI Roz Huntley fails to report for duty. AC-12 crank up their investigation into Operation Trapdoor, concerned that Michael Farmer will go to jail for crimes he didn't commit. With suspicions that Roz may have withheld crucial evidence, a new DCI is drafted in to run Operation Trapdoor. Kate makes progress in her undercover role, but AC-12's investigation falters when they realise that their main informant, forensic investigator Tim Ifield, has also gone missing.

star 7.90
1,392 votes
Directors: Jed Mercurio
Writers: Jed Mercurio
Behind Bars

#24 - Behind Bars

Season 2 - Episode 3 - Aired Feb 26, 2014

Lindsay is denied bail and finds herself targeted in prison. Growing increasingly desperate, she tells Kate about a relationship with an executive police officer and her theory of why she is being framed.

star 7.89
1,324 votes
Writers: Jed Mercurio

#25 - Terror

Season 1 - Episode 4 - Aired Jul 17, 2012

Desperate for proof of Gates's corruption, Fleming pushes her relationship with him to the limit. But her behaviour causes Morton to question if she might not be such a loyal colleague after all.

star 7.88
1,532 votes
Writers: Jed Mercurio