A part-time referee is found murdered, and Detectives Ed Green (Jesse L. Martin) and Cyrus Lupo (Jeremy Sisto) investigate the victim's gambling habits. The detectives are led to notorious hustler, 'Bunny' (guest star Bobby Jones), a familiar face from Detective Green's past. When 'Bunny' is found dead, Detective Lupo is called to the scene and discovers his partner, Detective Green, is the shooter causing confusion in the department and disbelief in the DA's office. The case is turned over to internal affairs Detective Kevin Bernard (Anthony Anderson) and Sergeant Gregory Cole (guest star Peter Bradbury), leaving Detective Green to face his dark past and in danger of losing his badge. Sam Waterston, S. Epatha Merkerson, Linus Roache and Alana De La Garza also star.