Series 4

6 Episodes2017

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.

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Episodes (6)

Ep 1

Episode 1

★8.2

2017-03-26•58m

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

Ep 2

Episode 2

★8.1

2017-04-02•60m

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

Ep 3

Episode 3

★8.4

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.

Ep 4

Episode 4

★8.4

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.

Ep 5

Episode 5

★8.2

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.

Ep 6

Episode 6

★8.8

2017-04-30•58m

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