Shylah

Carey has her future mapped out—a promising graduate student with a bright career ahead of her. But when a shocking betrayal places her at the center of an ancient ritual, everything she believes about the world is shattered.
The ancient Celtic witch Shylah has found a way to escape the Celtic Otherworld. Her plan is simple: claim Carey's body, banish Carey's spirit to the Otherworld, and begin a new life among the living.
Stranded in a realm of myth, magic, and ancient powers, Carey struggles to find a way home before Shylah's possession becomes permanent.
But Shylah's return has not gone unnoticed. Devlin, a powerful Celtic warlock from the Otherworld, has crossed into the mortal world to pursue the witch. Determined to return Shylah to the realm she escaped, he may be Carey's only hope of reclaiming her stolen life.
To reclaim her life, Carey must survive the Otherworld, uncover the truth behind her betrayal, and confront an evil that refuses to remain buried.