Detective Sergeant Steven "Steve" Arnott, a former authorized firearms officer, is transferred to AC-12 after refusing to cover up negligence in a botched raid that resulted in the death of an unarmed man. Arnott partners with Detective Constable Kathrine "Kate" Fleming, a highly commended undercover officer, to investigate police corruption under the supervision of Superintendent Edward "Ted" Hastings.
After a man is mistakenly shot during a counter-terrorist operation, Steve Ar...