SERIES ONE: Lives and careers are on the line in this thrilling police anti-corruption drama following the investigation into DCI Tony Gates (Lennie James). Gina McKee, Vicky McClure, Martin Compston, Adrian Dunbar, Craig Parkinson and Neil Morrissey also star. SERIES TWO: When a police convoy is fatally ambushed, AC-12 pursue the sole surviving officer, DI Lindsay Denton (Keeley Hawes). Cast also includes Vicky McClure, Martin Compston, Adrian Dunbar, Craig Parkinson, Neil Morrissey, Mark Bonnar and Jessica Raine. SERIES THREE: When Firearms Officer Sergeant Danny Waldron (Daniel Mays) shoots dead a hardened criminal, AC-12 suspect foul play. Also starring Vicky McClure, Martin Compston, Adrian Dunbar, Craig Parkinson, Neil Morrissey, Leanne Best, Arsher Ali and Will Mellor. SERIES FOUR: When DCI Roz Huntley (Thandie Newton) captures a serial killer, the chief forensic investigator (Jason Watkins) alerts AC-12 to a possible miscarriage of justice. The cast also includes Vicky McClure,