The BEST Episodes of Line of Duty
Every episode ever - ranked by fan votes!
Last Updated: Sep 30, 2019
Network: BBC One
A drama about the investigations of AC-12, a controversial police anticorruption unit.
#1 - Breach
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?
8.61 
#2 - Royal Hunting Ground
Season 4 - Episode 6
While Nick Huntley faces lengthy questioning, AC-12 remain convinced of Roz's involvement.
8.32 
#3 - The List
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.
8.30 
#4 - Episode 6
Season 5 - Episode 6
In a nail-biting 90-minute finale, Hastings's secrets are laid bare. Will 'H' be revealed at last?
8.17 
#5 - Episode 4
Season 5 - Episode 4
Tensions rise in the OCG following the events at Eastfield. With troubling questions hanging over the identity of ‘H’, suspicions mount at AC-12.
8.15 
#6 - In the Trap
Season 4 - Episode 3
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.
8.14 
#7 - Episode 2
Season 5 - Episode 2
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.
8.09 
#8 - Lying Nest
Season 4 - Episode 5
DCI Roz Huntley struggles to allay her husband's suspicions. AC-12 find a new angle to pursue their case against her.
8.08 
#9 - Episode 5
Season 5 - Episode 5
As the hunt for 'H' intensifies, Steve and Kate wonder if Hastings is guarding a dark secret.
8.07 
#10 - Last Words
Season 2 - Episode 5
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.
8.05 
#11 - Moral Superiority
Season 4 - Episode 4
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.
8.03 
#12 - Episode 1
Season 5 - Episode 1
Following the deadly hijack of a police convoy, AC-12 target a ruthless organised crime group known to have links with corrupt officers.
8.02 
#13 - The Probation
Season 1 - Episode 5
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.
8.02 
#14 - Episode 3
Season 5 - Episode 3
Corbett’s most daring plan yet requires McQueen to exploit links with corrupt police officers. AC-12 make a shocking discovery.
8.01 
#15 - Blood Money
Season 2 - Episode 4
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.
7.99 
#16 - The Caddy
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.
7.99 
#17 - The Ambush
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 turn their spotlight on Lindsay Denton, the officer who led the convoy but escaped unscathed.
7.97 
#18 - Monsters
Season 3 - Episode 1
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?
7.95 
#19 - Negative Pressure
Season 3 - Episode 4
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.
7.95 
#20 - In the Shadow of the Truth
Season 4 - Episode 1
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.
7.94 
#21 - Who Sows the Wind
Season 4 - Episode 2
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.
7.92 
#22 - Carly
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.
7.91 
#23 - Snake Pit
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.
7.91 
#24 - Terror
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 if she might not be such a loyal colleague after all.
7.90 
#25 - Behind Bars
Season 2 - Episode 3
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.
7.88