Winter of the Witch by Katherine Arden

The third installment of the Winternight Trilogy is just as powerful as the first. Vasya has grown from the timid little girl who takes care of the old mythical beings, talks to horses and fall in love with the magic of the forest to a formidable warrior woman and witch.
She has taken on the task of unifying Russia and trying to have a world where the old faith and new religion can coexist. First, she must help save Moscow, her family and make her way back to her beloved Winter King who will risk all to save her. The twin spirits of the Winter King and the Bear are magical and yet act as men and Katherine Arden has a gift of getting her readers to not only care about the warring humans but also the mythical spirits of old and creatures from fairy tales. This is one of the finest blends of fairy tale and history out there and will appeal to any reader from fantasy lover to the Russian classics. I hate to see this series end - magical as the first snow and memorable as a first kiss.