Description of book

Undine thinks she could be happy living in a world where Stephen is still alive. Back in the real world, Trout could be happy too - as long as he doesn't think about Undine's disappearance, or why her shadow appears in his photographs. Phoenix is new in town, a drifter, passing through with his conjuring tricks.
But they can't keep drifting forever, and one hot summer night their worlds collide. Coincidence or confluence? Illusion or reality? Trout isn't sure he wants an answer and Phoenix isn't telling. All Undine knows is that she must find a way to return home. Someone is calling her name. Sister, come to me...
In the spellbinding conclusion to the Undine trilogy, the girl and the magic must become one to quell the darkness forever.