When ten-year-old Petya gets a new nanny—odd and grumpy, yet incredibly charming—he quickly realizes she is not like anyone else. She is a “nanny under cover,” and in fact Yaga, the legendary sorceress who has lost her magical mortar and gone into hiding among humans.
Now only Petya can help her recover her magical powers, while Yaga will teach the boy how to fly—not only in a mortar, but through life as well.