Line of Duty

Steve Arnott realizes the target in his anti-corruption case is the city's top detective.

Having been duped into covering up Jackie's crime, Gates tries to sever ties with her.

Arnott is convinced Gates played a part in Jackie’s disappearance. With Fleming’s help, the anticorruption team try to trap Gates into revealing his involvement in covering up Jackie’s crimes.

Desperate for proof of Gates’s corruption, Fleming pushes her relationship with him to the limit. But her behaviour causes Morton to question if she might not be such a loyal colleague after all.

With Gates on the run, the anti-corruption team come under pressure to close the case.

A brutal ambush on a police convoy leaves three officers dead and a protected witness fighting for his life. AC-12 turns the spotlight on Lindsay Denton.