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.

Kate and Steve attempt to track down a lead. A fresh police leak enables another audacious raid, while 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 hanging over the identity of 'H', suspicions mount at AC-12.

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

Hastings' secrets are laid bare. 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?