Stefano is the rebellious son of Pietro De Luca, rich owner of a well-known publishing house. The young man spends his days in the name of recklessness and seems to take particular pleasure in provoking his elderly father. On the occasion of the wedding of his friends Leo and Maria, Stefano is commissioned to accompany the bride's best man, the pretty neurologist Chiara. The girl has just emerged from a stormy sentimental relationship with her colleague Massimo and a deep feeling is established between her and Stefano from the first glance. The weekend before the wedding, Stefano and Chiara have a relationship in Leo's country villa and start a relationship.