A young psychologist Doubravka (Daniela Kolárová) swimming in a pool meets Honza Machácek (Jaromír Hanzlík) who summers co-op cows nearby. Honza likes the racy girl at the first sight and his directness imposes on Doubravka too. They start to date. Honza comes from a big family, he was degraded to a cowboy when he had a tractor accident caused by alcohol and lost his driving license. In the summer cabin, Doubravka takes care of Bobo (Oldrich Vízner) - a student of medicine who prepares for an one exam for the third time. He is selfish and in his uncertainty he behaves to Doubravka uninterestedly and outrageously. Honza supposes Doubravka looks after a crazy person, yet soon he learns that Bobo is Doubravka's boy-friend. On the other hand, Doubravka finds a girl's name tattooed on Honza's arm and troubles come.