Line Of Duty

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Season 4
While Nick Huntley faces lengthy questioning over his role in Tim Ifield's murder, AC-12 remain convinced of Roz's involvement. (Final)
DCI Roz Huntley struggles to allay her husband's suspicions. AC-12 find a new angle to pursue their case against her.
AC-12 interrogate Roz's husband, Nick, but the discovery of new forensic anomalies puts the spotlight back on Roz.
AC-12 uncover holes in the case against Michael Farmer. Could the real killer still be at large?
A dismembered body is found, and worries grow when DCI Roz Huntley fails to report for duty. AC-12 challenge the case against Michael Farmer.
The hit police corruption drama returns for a 4th series. When DCI Roz Huntley captures a serial killer, the chief forensic investigator alerts AC-12 to a possible miscarriage of justice.
AC12's loyalties are divided when DS Steve Arnott is suspended from duty. With his career in jeopardy, Arnott turns to an unlikely source for help.
Fresh testimony puts 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.
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.
Sergeant Danny Waldron and his armed response team shoot dead a hardened criminal, but soon cracks appear in their story. What are they hiding?
Gates returns to rescue Arnott but leaves before Kate, her cover now blown, arrives to find evidence that a body had been stored at the warehouse.
With tensions rising, Hastings and Kate focus on DI Dot Cottan. As Cottan begins to crack, the interrogation breaks off into an explosive chase that culminates in the revelation of the true identity of the Caddy. (Final)
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?
After the shooting at the drug house, DC Kate Fleming increases the pressure on Danny Waldron's armed response unit. Meanwhile an old AC12 investigation comes under legal scrutiny.
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.
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.
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.
A brutal ambush on a police convoy leaves three officers dead and a protected witness fighting for his life. AC12's Ted Hastings turns the spotlight on Lindsay Denton, the officer who led the convoy escaping unscathed.
With Gates on the run, the anti-corruption team comes under pressure to close the case once and for all. And tensions flare between Arnott, Fleming and Hastings.
With Arnott off the case, Fleming is determined to save the anti-corruption operation single-handed.
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