Drugstore manager Souska (Vladimír Mensík) is a honorable citizen of the little town of Sedlolupy and is to be elected the chairman of the local National Committee. His niece Lidunka (Lucie Zulová) is celebrating her sixteenth birthday and forces her beloved uncle to take her with him to Prague. In Prague's famous Lesser Town Café, the girl finds out that the uncle has a lover in the city, and thus begins to blackmail him a little. Uncle Souska has to spend the evening with her in a nightclub with champagne. On their return late at night, Lidunka tries to seduce the uncle, but he manages to resist and drops the girl in front of her house. The slightly drunk girl, however, does not want to go home yet and thus accepts the invitation of Souska's apprentice Frantisek (Jirí Vondrácek) to look at the Moon with him from the attic window. Here, Lidunka provokes the youngster, to make love to her. At home, she suggests by her behavior that she was violated.