A young student of an upper-class background who is surrounded by classmates that are of working-class backgrounds, after a novel in diary format by Enrico Bottini.

A lawyer, married but temporarily alone at home, finds himself in the house a beautiful lady who tries to escape from her jealous husband. Fascinated by the beauty of the unexpected guest, the lawyer is determined to conquer her, in vain. But when the woman leaves, she discovers that she has been stolen some money.

Unemployed Antonio is elated when he finally finds work hanging posters around war-torn Rome. However on his first day, his bicycle—essential to his work—gets stolen. His job is doomed unless he can find the thief. With the help of his son, Antonio combs the city, becoming desperate for justice.