6 episodes

Line of Duty - Series 4

First aired Mar 26, 2017Season 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.

Social

Community reviews for Line of Duty, shown here with its season details.

Splinter

Dec 26, 2018

10.0

We were stuck for something to watch on Netflix and hit play for the heck of it. What a pleasant surprise Line of Duty has turned out to be. It's gritty, very well acted and deals with the subject of police corruption and police investigating their own people. The characters are believable and the plots are very clever and at times quite gripping, especially the internal investigation interviews. Those alone are worth watching, as well as the courtroom scenes. I also like the attention to detail that is paid to investigations, where the outcome could hinge on the tiniest element either covered up by a corrupt officer, or missed by an investigator. Compulsive viewing for police drama fans.

Episodes

Episode 1

8.1

Mar 26, 201758 min15 votes

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

Episode 2

8.1

Apr 2, 201760 min14 votes

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

Episode 3

8.4

Apr 9, 201760 min14 votes

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.

Episode 4

8.4

Apr 16, 201759 min14 votes

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.

Episode 5

8.3

Apr 23, 201759 min14 votes

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

Episode 6

8.8

Apr 30, 201758 min13 votes

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