Line of Duty
A sergeant who refuses to be involved in a police cover-up joins an anti-corruption team.
Episode 1
S5 E1
When three police officers are shot dead during the hijacking of a seized-drugs transport, AC-12 moves in to investigate possible police collusion.
The Head of Medusa
S5 E2
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.
The Betrayal
S5 E4
Tensions rise in the OCG following the events at Eastfield, and with troubling questions hanging over the identity of "H," suspicions mount at AC-12.
Episode 5
S5 E5
As the hunt for "H" intensifies, Steve and Kate wonder if Hastings is guarding a dark secret.
Episode 6
S5 E6
As Hastings's secrets are laid bare, Kate and Steve are torn between loyalty and their duty to uncover the truth. Will the identity of "H" be revealed at last?
Who Sows the Wind
S4 E2
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.
In the Trap
S4 E3
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.
Moral Superiority
S4 E4
Nick is brought in for questioning by AC-12, but while Nick denies any involvement in Steve's attack, his suspicions about Roz mount. AC-12 discover new anomalies in the forensic evidence and issue DCI Roz Huntley with a second Reg 15 notice.
Lying Nest
S4 E5
DCI Roz Huntley struggles to allay her husband's suspicions. AC-12 find a new angle to pursue their case against her.
Royal Hunting Ground
S4 E6
While Nick Huntley faces lengthy questioning over his role in Tim Ifield's murder, AC-12 remain convinced of Roz's involvement.
Man Down
S3 E2
DC Kate Fleming uses her undercover role to increase the pressure on Danny Waldron's armed response unit; an old AC-12 investigation comes under legal scrutiny.
Line of Duty
S3 E3
DS Steve Arnott believes Danny Waldron compiled a list of his childhood abusers; while DI Cottan is commended for cracking the Waldron case, the spotlight falls on Arnott's questionable conduct in a previous enquiry.
Line of Duty
S3 E4
Fresh testimony launches AC-12 back on the trail a corrupt officer with links to organized crime.
The List
S3 E5
Steve Arnott's colleagues scrutinize him.
Breach
S3 E6
Arnott is arrested on suspicion of murder, and DC Fleming's undercover operation may hold the key to his innocence and the identity of the mysterious perp.
The Ambush
S2 E1
A brutal ambush on a police convoy leaves three officers dead and a protected witness fighting for his life; AC-12 turns their spotlight on the officer who led the convoy.
Carly
S2 E2
Kate Fleming is planted undercover in Lindsay Denton's Missing Persons Unit.
Bail Hearing
S2 E3
Lindsay finds herself targeted in prison and tells Kate her theory of why she is being framed.
Blood Money
S2 E4
Lindsay is granted special dispensation to visit her dying mother.
Taste of Freedom
S2 E5
Lindsay fights for her life as troubling details emerge of a vicious conspiracy.
A Disastrous Affair
S1 E1
Steve Arnott discovers his target is the city's top detective, Tony Gates.
Line of Duty
S1 E3
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.
Terror
S1 E4
Desperate for proof of Gates's corruption, Fleming pushes her relationship with him to the limit.
The Probation
S1 E5
With Gates on the run, the anti-corruption team comes under pressure to close the case; Arnott is forced to make some tough decisions about his loyalties; Fleming and Hastings go all out to catch Gates.