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.

The young widow Arianna (Alexandra Delli Colli) has recently married to a businessman Aurelio (Vito Fornari). She brings her children, Carlotta (Claudia Cavalcanti) and Gustavo (Alfredo Galloto) the new family. Carlotta has a relationship with Henry, but is attracted by the new stepfather and seduces him. Gustavo, however, prefer a gay relationship with Mario. At this point Arianna decides to introduce, by herself, her son the taste of a woman does the same to Mario in front of his son. Of the whole situation took advantage of two young blackmailers: Mario and Enrico.

Anna, a young saxophone player, investigates her sister's disappearance with the help of a friend.