Line of Duty

When three police officers are killed during the hijack of a seized-drugs transport, AC-12 investigate possible police collusion. As the body count rises, the team realise they're up against their most destructive adversary yet.

Kate and Steve follow a lead; a fresh police leak enables another audacious raid; Steve's attempts to gather information put him in a dangerous situation.

Corbett's most daring plan yet requires McQueen to exploit links with corrupt police officers; AC-12 make a shocking discovery.

Tensions rise in the OCG following the events at Eastfield; with troubling questions lingering over the identity of H, suspicions mount at AC-12.

As the search for H intensifies, Steve and Kate wonder if Hastings could be keeping a dark secret; Lisa grows distrustful of Hastings, Arnott, and Fleming.

Suspicions surrounding H's mysterious identity begin to point to someone they never expected; Arnott and Fleming look for evidence to clear their boss.