Brother and sister Bori and Olya Prikolsky have wonderful parents, but not a very wonderful life. And all because the parents entrusted the upbringing of their children to a governess named Kikimorova. Olya and Borya immediately understand that the governess hates children, but dad and mom don’t want to hear anything bad about her. After all, she works for them for nothing! And who knows how Kikimorova’s stay in this family would have ended if one fine day a completely mysterious person had not mysteriously appeared in the Prikolskys’ house - Avdotya Chemodanovna Svirepova. With her appearance, miracles begin to happen in the house, and could there be anything more beautiful than a miracle?