The book is told through three mediums. The first is a blog. The blogger has been tormented by the popular kids at school, especially Lucy Cunningham, for years. So when Lucy disappears the blogger is glad. Then we see through the kidnapper's eyes and learn what happens to those who vanish. The book is predominantly told through the point of view of Madison, a high school student whose popular classmates are disappearing one by one. She's friends with these people, though she's considered more of a goody two shoes in that she's polite and kind to those 'below' her in the school popularity chain. Though her cyber stocker still thinks she's a little too stuck up.
People paying close attention will figure out who the kidnapper is before the end, but the book is a lot of fun to read and shows some of the dangers of airing all your personal grievances on the internet. The characters are realistic high schoolers - in all varieties (the cool, the cruel, the picked on, the jocks, etc.). The story is quick to read and seeing the kidnapper's viewpoint keeps things tense and fast paced.