Harry Potter and the Half Blood Prince

In the sixth novel, Harry is starting to get suspicious of Draco Moulfoy and Severus Snape. Harry finds a book called the half blood prince, which has cheats to the potions that they make in class. After using it and getting caught, Harry is sent into turmoil and gets detentions for life from Snape. After accompanying Dumbledore on a mission to get a horcrux, Hogwarts is in battle with death eaters. A great character dies in the book, and Harry is more and more depressed. We learn what Voldemort's weakness is.
Rating: 9.7/10