|Vittorio Gassman||Bruno Cortona|
|Catherine Spaak||Lilly Cortona|
|Jean-Louis Trintignant||Roberto Mariani|
|Luciana Angiolillo||Bruno's wife|
|Linda Sini||Zia Lidia|
On a summer's day in Rome, Roberto Mariani, a withdrawn young scholar, encounters Bruno Cortona, a middle-aged man driving a stylish convertible. The chance meeting leads to drinks and eventually to an extended road trip out of the city. As the unlikely pair spend time together, they find out more about each other and even visit respective family members -- notably Bruno's beautiful daughter, Lilly -- on their impulsive outing.