Eddie Cusack is a Chicago police officer who only plays by his rules. A dangerous thing - especially now that he breaks the police's "code of silence" to uncover a cover-up scandal. As an outsider, he can no longer count on the help of his colleagues when he gets caught between the fronts of two rival drug lords. But Cusack is a one-man army. His weapons in the fight against crime are his razor-sharp mind, lightning-fast karate punches and a special surprise: "Prowler", a remote-controlled, rocket-equipped tank!