The Girl in the Tower (Winternight Trilogy #2)

Vasilisa's gift for seeing what others do not won her the attention, even affection, of Morozko--the winter demon from her nurse's stories. But his aid comes at a cost.

Orphaned, named a witch, and cast out by her village, Vasya's options are few: resign herself to life in a convent or marriage to a stranger. Both doom her to life in a tower, cut off from the wide world she longs to explore. So instead she chooses adventure, disguising herself as a young man and riding her trusted stallion, Solovey, into the wilderness.

But Vasya's exploits soon reunite her with her long-estranged siblings and earn her the admiration of the Grand Prince of Moscow. Disguised as a boy, she must walk a delicate line, safeguarding her family, concealing her identity and navigating her increasingly fraught relationship with Morozko--even as she realizes the realm is under threat from mysterious forces only she will be able to stop.