Dorato tips off Cusack that Tony Luna was lying low in Wisconsin, returning to Chicago that night by train. Eddie waits outside the station, watching as Luna climbs into Scalese's limousine. Scalese chastises his nephew for igniting a gang war. The driver notices Cusack following and a wild chase ensues. The limo strikes a stalled car and overturns onto its roof, with Luna and Scalese killed in the explosion. Cusack, in need of a partner, returns to police headquarters and retrieves the Prowler robot, single-handedly launching a full-scale attack on the Comachos' lair in East Chicago, Indiana.
Other detectives berate Cusack for his actions. Kopalas, fed up, tells everyone off and confronts Cragie, stating that he will no longer lie for him. He reveals to the squadroom that Cragie planted the gun on the teen he killed.
Cusack takes down the remaining Comacho members. Luis, wounded, enters a bathroom where Diana is bound. He raises a hammer, but Cusack shoots and kills him.