When Steve Arnott is transferred to a police anti-corruption unit, he finds his target is the city's top detective, Tony Gates. Can Gates really be as good as he appears? Arnott must engage in a cat-and-mouse struggle to uncover Gates' secret.
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Have a look at the filming of the scene at Queen's Chase Forest.
Interviews with the cast of Line of Duty 4
Laying bare his writing habits, habitats and career paths.