 Chicago, 1963. As head of the police department s Major Crime Unit, Lieutenant Michael Torello must deal with the city s most dangerous criminals. And possibly the most dangerous of all is Ray Luca, a young ambitious street hood who s out to gain wealth and power by whatever means - including theft, threats, extortion and murder. As Luca begins his ruthless climb up the ladder of organized crime, leaving a growing number of victims in his wake, Torello becomes more and more determined to bring him down.