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
AC-12 investigate DCI Jo Davidson's apparent mishandling of the murder of an investigative journalist.
AC-12 suspect a cover-up as an officer on DCI Davidson's team appears to have sabotaged the inquiry into Gail Vella's murder.
A new witness comes forward claiming to have crucial evidence in Gail Vella's murder. Kate is torn between her loyalty to Jo and to AC-12.
DCI Davidson faces increasing pressure from all sides. AC-12's attempt to interview a key witness goes horribly wrong.
AC-12 link Gail Vella's murder with a historic case of police corruption, and Kate hatches a plan to tell once and for all if Jo is bent.
As AC-12 struggle to deal with the repercussions of tragic events, Hastings makes one final bid to uncover institutionalized corruption.
With time running out, AC-12 attempt to unmask 'H',the fourth individual commanding the network of corrupt officers.