Drama series following the investigations of AC-12, a controversial police anti-corruption unit.
Cast:Martin Compston , Vicky McClure , Adrian Dunbar , Craig Parkinson , Gregory Piper , Aiysha Hart , Maya Sondhi , Keeley Hawes , Nigel Boyle , Polly Walker , Paul Higgins , Anneika Rose , Neil Morrissey , Tomi May , Ace Bhatti , Elizabeth Rider , Owen Teale , Kelly Macdonald
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.
Tensions rise in the OCG following the events at Eastfield. With troubling questions hanging over the identity of the mysterious H, suspicions mount among the AC-12 team.
As the hunt for H intensifies, Steve and Kate wonder if Hastings is guarding a dark secret.
The search for the mysterious H reaches its climax as long-buried secrets finally come to light.