Series 4

Season 4 · 2017 · 6 episodes

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.

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

Episodes