Soul Mates — Charles G. Dyer

When Martin Williams wakes up in Elly Blake's body, he sets wheels in motion that will deeply affect him as well as three other people. Not even his old Indian shaman friend can explain what happened in the spirit world. Egged on by her mother, Elly reluctantly befriends Martin. The shaky relationship introduces her to the spirit world. It's a domain in which the age-old battle of good versus evil is fought. She meets her spirit guide, and is convinced to join the fight against demons. She finds that dealing with the death of her father could have been so much easier. Will she finally change her solitary ways and find love?