A humble young woman takes care of his sister's child while also hiding her feelings towards her sister's lover.

Forced by her lover to sell her body, Renata is saved from a suicide attempt by Paolo Martelli, an engineer. She asks him to help her find a job. When Paolo's wife humiliates her, Renata gains revenge by seducing the woman's husband.

A meek and simple-minded boarding school teacher falls in love with a prostitute and gets the boot from school. He tries to have her change her way of living but she is very hard to convince. When she finally realizes he really loves her it is too late.

Piero is the leader of a group of university students who lead a carefree life. Finding himself in trouble and in need of money, he turns to criminal means—receiving aid from Daniela, the daughter of a rigid magistrate.