I'm sad it's over! It could have been so much longer and I would have loved every page. 
 The basic premise of the novel is a clash between Christianity and the old ways - the belief in house and nature sprites from Slavic lore. Vasya, the heroine, has the "sight" and can see and speak to the spirits. An imposing priest arrives in her village and seeks to erase the practice of leaving offerings for the spirits in return for protection and instead instills the fear of God's vengeance. Vasya does her best to sustain the spirits with her belief alone, although they are weakened by the village's abandonment. An evil force from the forest threatens the village and Vasya realizes only she and the sprites can protect everyone. Vasya's confident nature and her affinity for running wild through the forest instead of sitting quietly in the home fuel rumors that she is a witch. She is not blindly obedient and cannot be confined by the rules of men. Therefore, she must be wicked. Many themes emerge out of this struggle such as New Religion vs Old Religion, Good vs Evil, Civilization vs Nature, Imprisonment vs Freedom, Patriarchal Control vs Women's Autonomy, etc. 
 This book reminds me a lot of The Snow Child by Eowyn Ivey. Besides the obvious winter wilderness setting, I liked that instead of the story itself being a straightforward fairy tale, the characters live in a "real world" and grew up hearing these folktales. As the novel unfolds the characters become aware that their lives are mirroring the tales and perhaps the fairy tales are real. It was a great opportunity for the author to combine historical fiction (medieval Russia) with fantasy. 
 I would recommend this book to people who liked The Snow Child, Uprooted by Naomi Novik, and anything by Neil Gaiman that is based in myth and legend.