Series 4

Line of Duty

6 Episodes ★ 8.3 Premiered March 26, 2017

Season Overview

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

Episode 1
EP 1

Episode 1

Mar 26, 2017

★ 8.1

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

View Details 58 MIN
Episode 2
EP 2

Episode 2

Apr 2, 2017

★ 8.1

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

View Details 60 MIN
Episode 3
EP 3

Episode 3

Apr 9, 2017

★ 8.4

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.

View Details 60 MIN
Episode 4
EP 4

Episode 4

Apr 16, 2017

★ 8.4

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.

View Details 59 MIN
Episode 5
EP 5

Episode 5

Apr 23, 2017

★ 8.2

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

View Details 59 MIN
Episode 6
EP 6

Episode 6

Apr 30, 2017

★ 8.8

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

View Details 58 MIN