I usually like the books in this series. This one is not good. It's slow, and, while the ending is creepy, it's not an interesting book. It takes the reader too long to get to a mysterious point.
Beth has just moved into a new tonight neighborhood with her mom. She has no memory of her past, explained as a symptom of her "accident." Once in a while, she has nightmares about seeing her own image in a series of mirrors. She is homeschooled. Next door neighbor Chrissy is her only friend. One night at Chrissy's for a sleepover, Chrissy's cousin believes Beth is someone who was a student at her school last year. Beth becomes determined to find out who the look-a-like is.