在这部战书动作/犯罪/惊悚片中,沙克利是一名正直的警官，但从不受上级的赏识，直到临近退休才从新上任的局长手里接过一宗大案，要他到另一个城市把一宗毒案的重要证人莫利带到凤凰城出庭作证，当他要返回凤凰城的途中却连连被警方与黑帮分子追杀，种种迹象使他们明白，原来是凤凰城的警界与怨罪团伙相勾结，要杀他们灭口，正直的警官被激怒了，与莫利一起要杀回凤凰城报仇，他们故意将路线通知了敌人，和莫利两人开着一辆档满铁皮的大巴士一路开进了凤凰城，成百上千的警察受命拦截，车子被打得满目疮痍，在走投无路的情况下，二人相拥走出车门，穷凶疾恶的警察局长命令警察向他们开枪，慑于沙克利与莫利的正气，并无人听令，最终正义战胜邪恶，罪恶的警察局长死于莫利的枪下，二人相拥向远处走去。
In Phoenix, the alcoholic and mediocre detective Ben Shockley is assigned by the Chief Commissary Blakelock to bring the witness Gus Mally from Las Vegas for a minor trial. Shockley travels to Vegas and finds that Gus Mally is an aggressive and intelligent prostitute with a college degree and she tells him that the odds are against her showing up in court. Shockley learns that she will actually testify against a powerful mobster and the mafia is chasing them trying to kill them both. He calls Blakelock and request a police escort from Phoenix to protect them. But soon he discovers that someone is betraying him in the police department. Now, Shockley and Malley hijack a bus and Shockley welds thick steel plates and transforms the cabin in an armored bus trying to reach the Forum. But they will need to drive through a gauntlet of police officers armed with heavy weapons.
