Lera and Tonya, left without parents, live with Aunt Polina on weekdays, and with Aunt Alina on weekends. The latter is horrified that girls like to play pranks, get dirty and cause a lot of trouble. Lerka is very afraid of her strict aunt, but even more so of her neighbor, Serafima Ignatievna, calling her Baba Yaga, although she looks kind. And indeed, the neighbor turns out to be friendly: she meets the girls and begins to invite them to her place. As it turns out, Serafima Ignatievna knows many unusual things and can change people's destinies. By chance, Aunt Alina becomes involved in a story that takes a dangerous turn. Only the girls know that it all started with Lerka’s curiosity, but they are silent about it, fearing that they will no longer be trusted. In addition, they are taken in by Aunt Polina, who arrives so suddenly that they do not have time to do anything. The tangle of events becomes more and more entangled, and its end leads very far. However, the story ends quite happily, although not without losses.