At the beginning of the eighties, Sirio, a young worker of the Terni steelworks with a past in student protesting, decides to abandon his job to join an extreme left-wing group. Although he declares himself contrary to the armed struggle following the decision by some elements of the group to carry out terrorist actions, he is arrested upon being caught with his best friend Apache.

A judge on crusade to take down the Italian Mafia uses a gangster turned state's witness (a so-called "repenter") and a New York banker to do it. But things aren't quite what they seem.

Django comes to town to discover that his brother Steve, accused of robbing a bank, has been lynched. Django believes the real culprit is Sartana and challenges him to a duel. Just in time he discovers that the author of the crime is an important local figure and Django and Sartana join forces to punish him.