Out of Russia's northern forests, once every generation or so, an evil wolf named Blood Prince walks, causing two young children to seek the witch Baba Yaga and ask her help in saving their village.
Serafina is summoned from her village to the magical cottage of a great aunt she has never heard of and learns that she is meant to become the new Baba Yaga, whose magical role is answering the first question any stranger might ask her with the truth.