Instruct: Classify the given review as either positive or negative.
Query: Unforgettable.

Derailed is the kind of book that makes you want to call someone while you're reading it. You will want to tell that person to not call you for the rest of the day. You will pick this book up, open to the first page, and not stop reading until you reach the end. It took me five hours to read. I did so non-stop. You will, too. What an incredible, surprising ride. Wow.