This book completely exceeded my expectations. It ended up being really disturbing and creepy in the most awesome way.
It starts when the girl is found, Annaliese Rose Gordon, who has been missing for a year. She is returned to her parents with no memories of where she was and no memories of her old life. As bits and pieces come back to her, one thing becomes apparent: she is not Annaliese Rose Gordon.
You can read my full review here.