Line Of Duty

When three police officers are shot dead during the hijack of a seized drugs transport, AC-12 move in to investigate possible police collusion.

A fresh police leak enables another audacious raid, while Arnott'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. Meanwhile, the AC-12 team make a shocking discovery.

AC-12 attempt to capture Corbett but Steve and Kate question Hastings' motives.

As the hunt for "H" intensifies, Steve and Kate wonder if Hastings is guarding a dark secret.

In a nail-biting 90-minute finale, Carmichael's dogged interrogation of Hastings presents mounting evidence of suspicious behaviour. Caught in the crossfire, Kate and Steve are torn between loyalty to Hastings and their duty to uncover the truth, however painful. Will the identity of "H" be revealed at last?