Line of Duty Series 4
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.
26 March 2017
Episodes
1. Episode 1
DCI Roz Huntley is under intense pressure from her superiors to apprehend a serial murderer after months of fruitless investigation.
26 March 2017
2. Episode 2
AC-12 crank up their investigation into Operation Trapdoor. Kate makes progress in her undercover role.
02 April 2017
3. 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.
09 April 2017
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.
16 April 2017
5. Episode 5
DCI Roz Huntley struggles to allay her husband's suspicions. AC-12 find a new angle to pursue their case against her.
23 April 2017
6. Episode 6
While Nick Huntley faces lengthy questioning, AC-12 remain convinced of Roz's involvement.
30 April 2017
