The main character of the story, which is a sensitive probe into the soul of a little girl, is five-year-old Kačka Znamínková, who lives with her parents in a picturesque village in the foothills. And because she has a very vivid imagination, she becomes not only a princess with a golden star on her forehead, but also a princess on a pea or a crocodile hunter. Together with her parents, she is expecting a new sibling to be born any day, but she will only be happy if it is a little sister. She doesn't even want to hear about a little brother. But in the end, instead of the expected little sister, she gets two brothers, so...