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Line of Duty

Line of Duty Series 4: Episode Guide & Ratings

2012TV Series"If you think catching criminals is tough, try catching police officers."
Audience Score
85

Series 4 Plot

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.

Line of Duty Series 4 aired on March 25th, 2017.

Series 4 Episodes

83

1. Episode 1

March 26th, 201758 min

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

82

2. Episode 2

April 2nd, 20171 hr

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

86

3. Episode 3

April 9th, 20171 hr

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.

87

4. Episode 4

April 16th, 201759 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.

83

5. Episode 5

April 23rd, 201759 min

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

89

6. Episode 6

April 30th, 201758 min

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

All Seasons

Series 6

Series 6

78
Mar 20, 2021
Series 5

Series 5

87
Mar 30, 2019
Series 4

Series 4

85
Mar 25, 2017
Series 3

Series 3

85
Mar 23, 2016
Series 2

Series 2

84
Feb 11, 2014
Series 1

Series 1

75
Jun 25, 2012
Specials

Specials

Mar 17, 2016