I'd say that this book is an odd one by Sara Shepard. It is the type of book for girls who love a mystery, and at the same time, it is a slightly inappropriate book.The story is about four girls who are really close-knit. What they share now is a mystery in their past: One night, during the summer before eighth grade, their leader, Allison, disappeared without a trace. They've drifted apart but come back together when they start receiving strange messages from someone named "A" who seems to know all their secrets, past and present.They get a little creeped out, but hang on. Later, the police uncover Alison's body found under a concrete slab. The entire series drags out until they find out who "A" is and put a stop to these horrid messages. This book has plenty of mature content, but there is a strong message to those who read it. Bottom line is, it would most probably be suitable for children above 13!
