Join or Sign In
Sign in to customize your TV listings
By joining TV Guide, you agree to our Terms of Use and acknowledge the data practices in our Privacy Policy.
Line of Duty Season 4 Episodes
Season 4 Episode Guide
6 Episodes 2017 - 2017
Line of Duty returns forafourth series, as AC12 continues to hunt for any corruption lurking within the police.
Episode 1
Episode 1
Sun, Mar 26, 2017 60 mins
DCI Roz Huntley is under intense pressure from her superiors to apprehend a murderer.
Episode 2
Episode 2
Sun, Apr 2, 2017 57 mins
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.
Episode 3
In the Trap
Sun, Apr 9, 2017 59 mins
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.
Episode 4
Moral Superiority
Sun, Apr 16, 2017 58 mins
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.
Episode 5
Lying Nest
Sun, Apr 23, 2017 58 mins
DCI Roz Huntley struggles to allay her husband's suspicions. AC-12 find a new angle to pursue their case against her.
Episode 6
Royal Hunting Ground
Sun, Apr 30, 2017 60 mins
Even as Nick Huntley is grilled for hours about his role in the murder of Tim Ifield, AC-12 is sure about the involvement of Roz.
