Ray Hughes (Hines) and Danny Costanzo (Crystal) are two police officers working on Chicago's North Side, known for their wisecracking demeanors and unorthodox police methods, which get results in their various cases. One such case involves trying to bust up-and-coming drug dealer Julio Gonzales (Jimmy Smits). After arresting Snake (Joe Pantoliano), one of Julio's associates, they convince him to wear a wire in order to get the necessary evidence to put Julio away. When they approach the meeting place (a cargo ship) they find that Gonzales has acquired a large store of Israeli Uzi submachine guns. Snake is setting the detectives up, however, prompting the detectives to rush in by acting as though Gonzales was preparing to kill him. Gonzales reveals his ambition to be the next "godfather" of Chicago, but chastises Snake for letting the detectives get close, and Snake is shot dead by a subordinate. The pair look as though they will be killed for sure, but two undercover detectives in Julio's gang step in to make the arrest. In the ensuing gun battle, most of Julio's gang escape, but Ray and Danny capture Gonzales.