Nico Toscani is an Italian immigrant, American patriot, ex-CIA agent, aikido specialist and unorthodox Chicago policeman. He is as committed to his job as he is to his personalized brand of justice—expert and thorough bone-crushing.

Former pool hustler "Fast Eddie" Felson decides he wants to return to the game by taking a pupil. He meets talented but green Vincent Lauria and proposes a partnership. As they tour pool halls, Eddie teaches Vincent the tricks of scamming, but he eventually grows frustrated with Vincent's showboat antics, leading to an argument and a falling-out. Eddie takes up playing again and soon crosses paths with Vincent as an opponent.

A Chicago cop is caught in the middle of a gang war while his own comrades shun him because he wants to take an irresponsible cop down.