Twelve-year-old Edek comes on vacation to his aunt Hela, who lives by the lake. There he meets a group of his peers, and among them the charming Monika. They walk in the woods, go to the beach, but the relationship ends when Monika leaves Edek for Alka, who has rich parents, and Honorka, who is in love with Edek, reveals Monika's secret to him.