This book is so strange that it's difficult to review, especially without giving away the plot. Practically anything said about the plot will either give away information or mislead the reader.
Suffice to say, this book works well as teen fiction. It's engaging, dark, twisty, and mysterious, with a dash of choose-your-own-ending that gives the reader ultimate power over the truth of the story.
My one complaint is this: while the reader must ultimately choose between a supernatural explanation and a more commonplace explanation, I felt that choosing the commonplace explanation was next to impossible because no time was devoted to its development. Because the story the reader mainly lives with is the supernatural one, it hogs the spotlight.
Recommend to: Ages 14+ (sexual situations), mystery fans, sci-fi/fantasy fans, anyone looking for something offbeat