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Line of Duty · Season 4 · BBC One

Line of Duty Season 4

Line of Duty Season 4 is a MUST-WATCH, BollyMeter 8.8/10. 6 episodes on BBC One from 26 March 2017.

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BollyMeter8.8/10100 percent on Rotten Tomatoes; Thandiwe Newton's DCI Roz Huntley brought a new register of moral complexity to the suspect role.

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What BollyAI Thinks

Series 4 maintains a perfect critical record with Thandiwe Newton as DCI Roz Huntley, the season’s central suspect. Newton’s performance stands out for its calculating, compartmentalised control, paired with sudden vulnerability in key moments. The AC-12 procedural mechanics are now familiar, so Mercurio’s scripts emphasize how institutional corruption operates as a system rather than as isolated misconduct, while still sustaining episode-level tension through the interrogation sequences. The fourth consecutive 100 percent Rotten Tomatoes score confirms the show as one of the strongest long-running procedural series on British television.

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The Room

100%critics positive8.7/10IMDb audience

Season Over Season

Thandiwe Newton’s guest lead matches that high bar, sustaining the perfect critical record into a fourth year.