Lt. Mike Torello, the head of Chicago's Major Crime Unit in the early '60s, takes a personal interest in a case involving the son of a close friend who gets mixed up with a mobster.

Lt. Mike Torello's pursuit of Ray Luca gets personal when the son of a close friend gets mixed up with the mobster.

A psychopathic killer becomes the Major Crime Unit's top priority; Torello learns of Luca's plans for a nationwide sports-betting operation; Julie wants to start a family.