1: Episode 1
Mar 26, 2017
DCI Roz Huntley is under intense pressure from her superiors to apprehend a serial murderer after months of fruitless investigation.
Series 4
Line of Duty
6 EPISODES • 2017
The fourth series sees AC-12 facing their most devious opponent yet! Under pressure from her superiors, DCI Roz Huntley charges a young man with a series of murders after months of fruitless investigation, but is he guilty? The Chief Forensic Investigator has doubts and turns to AC-12.Episodes
2: Episode 2
Apr 2, 2017
AC-12 crank up their investigation into Operation Trapdoor. Kate makes progress in her undercover role.
3: Episode 3
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.
4: Episode 4
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.
5: Episode 5
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.
6: Episode 6
Apr 30, 2017
While Nick Huntley faces lengthy questioning, AC-12 remain convinced of Roz's involvement.
Season 5
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