AC-12-yksikkö pureutuu poliisikorruption ytimeen paljastaen valheita, vallan väärinkäyttöä ja vaarallisia salaisuuksia, jotka vievät heidät yhä syvemmälle varjomaailmaan.
A brutal ambush on a police convoy leaves three officers dead.
AC12's Kate Fleming is planted undercover in Lindsay Denton's Missing Persons Unit.
Lindsay is denied bail and finds herself targeted in prison.
Lindsay is granted special dispensation to visit her dying mother.
Lindsay fights for her life against the conspiracy of corrupt police officers.
AC12's investigation finally exposes a vicious criminal gang run from within the police.