Ghost Spell. The Ghost World Sequence, #4

Under a freezing Arctic sky, a wolf carries a baby to a remote village. Taken in by the villagers and named 'Vulchanok' or 'Little Wolf', the lost baby grows into a happy little boy. But night after night, his dreams are walked by his rescuer, the wolf-witch. She leads him to the Ghost World and makes him a shaman. The villagers begin to fear him and he grows into a lonely man -- until he sees a vision of a lovely girl as lonely as himself, imprisoned in a small room.
Shrugging on his falcon skin, he flies to find her. When a falcon drums its wings against her window, Kristiana opens it -- and is astonished when the hawk lights on the floor and turns into a man. She and Vulchanok are soon in love. But Kristiana's brother, Glev, will never allow her to marry a dirty northern huntsman -- and Vulchanok's wolf-wife is fiercely jealous. Can the lovers survive the hatred and jealousy surrounding them?