Clumsy public security officer helps an adventurer (Laura Antonelli) to escape from Italy. In order not to undergo a punitive transfer to Barbagia, he goes back on the woman's trail to take her to prison.

Two groups of students - the third-class high school students and the matured accountants - decide to perform a show to celebrate the last day of school.

Giorgio, Walter and Dario's dream is to own a boat. Meanwhile, they overcome boredom by inventing an endless series of jokes. Between the three and the rich boys in the area led by Fernando there is a strong rivalry that will become more acute with the arrival of the beautiful Karin, a young German with an ambiguous past.