When LAPD elite cop Billy Beckett is traumatized by his partner's death, Joseph Armstrong recruits him for his secret Special Investigation Squad, an elite quartet which gets a very free hand to hunt down and eliminate some of the worst criminals which would escape justice. Despite colleague Gabriel's suspicion and a reporter who hired a private detective to expose their 'police abuse', he proves his value in the fight against ruthless gangster Vic, who sacrifices even his weakling brother for a major diamond robbery.