AC-12-yksikkö pureutuu poliisikorruption ytimeen paljastaen valheita, vallan väärinkäyttöä ja vaarallisia salaisuuksia, jotka vievät heidät yhä syvemmälle varjomaailmaan.
Sergeant Danny Waldron and his armed response team shoot dead a hardened criminal.
After the shooting at the drugs house, DC Fleming increases the pressure on Danny Waldron.
DS Steve Arnott believes there is a dark secret in Danny Waldron's past.
Fresh testimony launches AC-12 back on the trail of a corrupt officer.
Loyalties are divided when DS Steve Arnott comes under scrutiny from his colleagues.
Does DC Kate Fleming's undercover operation hold the key to the identity of the Caddy?