AC-12-yksikkö pureutuu poliisikorruption ytimeen paljastaen valheita, vallan väärinkäyttöä ja vaarallisia salaisuuksia, jotka vievät heidät yhä syvemmälle varjomaailmaan.
Steve Arnott realises 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.
Desperate for proof of Gates's corruption, Fleming pushes their relationship to the limit.
With Gates on the run, the anti-corruption team come under pressure to close the case.