Three characters' misadventures in semi-deserted, summertime Rome: a dim-witted mama's boy falls for a tourist; a would-be womanizer struggles to find company for his sex tourism trip to Kraków; a hippie is drawn into his father's schemes to bring him back into polite society.

In 18th-century Rome, impish aristocrat Onofrio del Grillo amuses himself by playing pranks on all sorts of people — his reactionary family and fellow nobles, the poors, the French occupiers trying to modernize society, and even the Pope himself.

Sergio Benvenuti is a shy seller of contracts for a Roman company of music, but because of his character he cannot find even a customer, so he asks for help from a fellow named Nadia.

Carlo, a police officer, after intercepting a call conducts a drug bust at a private party at the upper class apartment of Rosanna Clerici and she is arrested. Just as the police and party guests are leaving, Giulio, Rosanna's six-year-old son, comes out of his room and asks Carlo where his mother is. Seeing that Carlo is the person responsible for his mother's arrest, Giulio tags along with him until his mother is freed. Carlo does everything possible to have Social Services or somebody look after the kid but is told by the Courts that he is the best candidate for his custody until a better one is found. Even though Giulio manages to turn Carlo's life inside out he ends up getting to like the kid and falling for the kid's mother, Rosanna, while she is in prison. It ends with Rosanna being released from prison and the three of them going out for dinner.

The investigations of a private eye shake up the almost broken marriage of a middle aged couple.