Fifteen-year-old Kateřina will once again spend the holidays at the Castle Krabonoš, where her parents are both wardens. She finds it dull because she's got to sit at the castle's ticket office and sell tickets. That is, until the arrival of the new tour guide, Petr, a young history student. She falls in love at first sight. But for Petr she's just a young crazy girl. Katka tries to get Petr's attention in various ways, but all in vain. She makes a last ditch effort by pretending to steal some rare castle steins from the castle's collection. It's only after some detectives arrive that Katka realizes that she may have overdone it, but she finally manages to get Petr to notice her.

Sylva Julinová
as Katka

Jan Hartl
as Petr

František Husák
as Katka's Father

Zdena Hadrbolcová
as Katka's Mother

Jana Tomšů
as Ida

Eva Holubová
as Hanka

Tomáš Vacek
as Tonda

Jiřina Jelenská
as Těšíková

Stanislav Tříska
as Gusta Těšík

Pavel Klůs
as Pavluša