After 11 years of marriage, Anna decides to leave Enrico on the very day her husband has organised a surprise birthday party for her. Anna agrees to participate so as not to humiliate Enrico and not to hurt her son Pietro.

Anna and Enrico tried but couldn't make it: the marriage falls apart and they accuse each other. It will be a social worker, Rosa Puglisi, who will have to determine which of the two deserves custody of the child.

The social worker investigates Pietro's first months of life and his mother's caring skills. To oblige her to this move are the accusations made by Enrico to Anna and the evidence that he has collected to demonstrate his wife's behaviour.

Enrico goes from accuser to accused. The social worker notices some suspicious episodes in her son's past. Furthermore, Rosa Puglisi collects the testimony of the coach of Pietro's football school.

Once the whole story of Anna and Enrico has been retraced, the social worker just has to focus on the days that preceded their break-up. Rosa learns of the party with which Enrico won Anna back just three months earlier.

The social worker now knows the truth about Anna and Enrico, and writes it in his report for the judge. The result is that Pietro is taken from both parents and placed first in a family home and then with Andrea.