Due to lack of means, the Chamodot family is forced to live in a caravan. Emile, a 15 year old boy, is suffocating there, between a mother obsessed with a healthy lifestyle and a whimsical father. He falls in love with Pauline, a young harpist from a wealthy family, who invites him to Venice for a concert. However, his parents decide to accompany him to Venice with their caravan...