Air date: 2017-03-26

Runtime: 58 min

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

Air date: 2017-04-02

Runtime: 60 min

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

Air date: 2017-04-09

Runtime: 60 min

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.

Air date: 2017-04-16

Runtime: 59 min

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.

Air date: 2017-04-23

Runtime: 59 min

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

Air date: 2017-04-30

Runtime: 58 min

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