Line of Duty

When DS Steve Arnott joins the anticorruption unit, he learns that the target of his first investigation is the well-respected DCI Tony Gates. Though Gates's professional conduct appears above reproach, his private life may provide his enemies the evidence they seek.

After winning Gates's trust, new team member DC Kate Fleming begins to pay close attention to his work. Scrambling to cover his tracks, Gates fears he is about to lose the two most important things in his life his career and his kids.

Witness to a murder, Gates realizes he has more to cover up than his own misdeeds. Meanwhile, an increasingly confrontational Arnott closes in on Gates, prepared to take more and more risks to bring him down.

With Arnott off the case, Fleming plays on her relationship with Gates in an effort to uncover the truth. In the process, she brings on herself the attentions and suspicions of Gates's loyal lieutenant, DC Morton.

Tensions erupt between Hastings, Arnott, and Fleming as they decide on the next steps in the case. Increasingly desperate and unwilling to await his fate, Gates goes on the run, ready to play one last card.