Winter of the Witch

Winter of the Witch, book 3 of Katherine Arden's Winternight trilogy.

Vasya, descendant of Baba Yaga

Ded Grib, the first of Vasya's followers

Medved, the Bear who feeds on fear

Morozko, the Winter King

Alyosha, brother to Vasya, warrior priest

Lady Midnight, friend or foe, is up to Vasya