Line of Duty: Season 4 (2017)


Season 4
Line of Duty

Critics Consensus

Line of Duty's gripping fourth season is an adrenaline-fueled thrill ride from start to finish.



Critic Ratings: 15


Audience Score

User Ratings: 69

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Air date: Jun 22, 2019

DCI Roz Huntley is under intense pressure from her superiors to apprehend a murderer.

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Air date: Jun 29, 2019

A dismembered body is discovered, and worries grow when DCI Roz Huntley fails to report for duty. AC-12 crank up their investigation into Operation Trapdoor, concerned that Michael Farmer will go to jail for crimes he didn't commit. With suspicions that Roz may have withheld crucial evidence, a new DCI is drafted in to run Operation Trapdoor.

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Air date: Jul 6, 2019

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. While Steve fumes over this contradictory testimony, Kate uses her newfound respect to inveigle herself with the Trapdoor team.

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Air date: Jul 13, 2019

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. Meanwhile, AC-12 discover new anomalies in the forensic evidence and issue DCI Roz Huntley with a second Reg 15 notice. AC-12's case appears watertight until Roz starts dismantling their evidence with inside information of her own.

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Air date: Jul 20, 2019

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

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Air date: Jul 27, 2019

Even as Nick Huntley is grilled for hours about his role in the murder of Tim Ifield, AC-12 is sure about the involvement of Roz.

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Line of Duty: Season 4 Photos

Tv Season Info

Line of Duty returns forafourth series, as AC12 continues to hunt for any corruption lurking within the police.

Cast & Crew

Jason Watkins
Tim Ifield
Vicky McClure
DC Kate Fleming
Martin Compston
DS Steve Arnott
Lee Ingleby
Nick Huntley
Adrian Dunbar
Superintendent Ted Hastings
Jed Mercurio
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News & Interviews for Line of Duty: Season 4

Critic Reviews for Line of Duty Season 4

All Critics (15) | Top Critics (5)

How Jed Mercurio turns acronyms into utterly natural TV dialogue, and makes lanyards so damned sexy, are two of the great mysteries of our age.

Apr 7, 2017 | Full Review…

Much as I love the cast and the dialogue, this season's plotting verges on the farcical.

Jan 3, 2018 | Rating: 3/5 | Full Review…

What is beyond dispute is that Thandie Newton's DCI Roz Huntley was a startling creation, equal parts brittle anxiety and relentless, shameless calculation.

Dec 18, 2017 | Full Review…
Top Critic

This is less like watching TV, and more like being abducted by it, cuffed, then dragged along.

Jun 28, 2017 | Full Review…
Top Critic

The plots are wonderfully dizzying. But what I love is the great moral center to the series provided by Hastings, a quirky, sometimes cranky, hard to love, but easy to admire leader of this beleaguered anti-corruption team.

Dec 19, 2019 | Full Review…

...Line Of Duty takes the familiar police procedural drama and turns it on its head. There are layers upon layers at work. So when you think a line of inquiry is putting one individual in the frame, a different suspect emerges.

May 20, 2019 | Rating: 5/5 | Full Review…

The series was perhaps a touch more over-the-top than previous ones, but it was still bloody brilliant television, leaving viewers with more unanswered questions than ever before.

Oct 17, 2018 | Full Review…

Line of Duty is animated by a sharp intelligence in both the plotting and the writing.

Dec 26, 2017 | Full Review…

[Line of Duty] is utterly gripping, with the show continuing to capitalise on the 'main character gets killed early' trope they started.

Sep 6, 2017 | Full Review…

The finale was phenomenally exciting.

Aug 30, 2017 | Rating: 5/5 | Full Review…

Line of Duty (BBC1) came to a nail-bitingly exciting end, or rather to three nail-bitingly exciting ends, two of them unforeseeable by even the most imaginative of viewers.

May 9, 2017 | Full Review…

Out of nowhere, the tempo suddenly rocketed from quietly-creeping tension to brain-jangling red alert.

Apr 4, 2017 | Rating: 4/5 | Full Review…

Audience Reviews for Line of Duty: Season 4

  • Aug 10, 2020
    Another gripping story from Line of Duty. Maybe not as exhilarating as previous seasons, but does not disappoint.
  • May 25, 2020
    You just know the bad guy is going to get away with their deed, biting fingernails. Yelling at the screen.
  • Aug 16, 2019
    I watched up to Season 4 but I won't watch more. Its very well written and acted. Unfortunately the BBC Diversity Police got their clutches on what could have been a great drama. If you'd never been to the UK and watched this you'd think A. that 30% or more of the UK population is Black, which it isn't (Its less than 10%) and B. Most of the most physically demanding police jobs in the UK are done by Women, which is not the case by a very long way. The finale of Season 4 was farcical and a big let down after hours spent watching the build-up!. As a Brit I can't stand to watch any more of this grossly misrepresented view of British society.
  • Jul 20, 2019
    The core characters continue to develop in this excellent series.
  • Jun 15, 2019
    A bit disappointing compared to the first three series, I didn't fnd the performances beleiveable. Maybe the Director/Producer had been briefed to make it really fast paced. Maybe they felt something to prove because Thandi Newton was on board. There was no space for the characters or story to breathe. Disappointed.
  • Jul 24, 2018
    Gripping throughout as always.
  • Jul 22, 2018
    Started out ok, but just kept getting more and more ridiculous. Really incredibly stupid by the end.
  • Jul 11, 2018
  • Jan 10, 2018
    Best season so far. Very focused script with no side stories unless relevant. Fantastic storytelling.
  • Jul 15, 2017
    Love this show Amazing Can't wait to see what happen next

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