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.

1. 

   1. Episode 1

   2017-03-26 · 58m

   DCI Roz Huntley is under intense pressure from her superiors to apprehend a serial murderer after months of fruitless investigation.

2. 

   2. Episode 2

   2017-04-02 · 60m

   AC-12 crank up their investigation into Operation Trapdoor. Kate makes progress in her undercover role.

3. 

   3. Episode 3

   2017-04-09 · 60m

   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. 

   4. Episode 4

   2017-04-16 · 59m

   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. 

   5. Episode 5

   2017-04-23 · 59m

   DCI Roz Huntley struggles to allay her husband's suspicions. AC-12 find a new angle to pursue their case against her.

6. 

   6. Episode 6

   2017-04-30 · 58m

   While Nick Huntley faces lengthy questioning, AC-12 remain convinced of Roz's involvement.