Harry Potter and the Chamber of Secrets by J.K. Rowling (Mystery/Suspense/Ages 9-12)
In The Chamber of Secrets there is a big mystery, and to me there was a lot of suspense. Harry and his friends find out that the chamber of secrets has been opened and they try and find out who opened it. Along the way a cat, a ghost, and 4 kids get petrified, they find T.M.'s journal, Harry learns he can speak snake, and Harry finds out who opened the Chamber... Ginny, Ron younger sister. I would really recommend this book, and you can go to Barnes & Nobles or the Carmel Clay Public Library to get it.