Harry Potter and the Deathly Hallows

From Conservapedia

Harry Potter and the Deathly Hallows (released on July 21, 2007) is the seventh novel in the Harry Potter series by J.K. Rowling. Harry is an adult now and has to finish off Lord Voldemort. The Dark Lord now controls Hogwarts and appoints his henchmen Snape as headmaster. Harry has to destroy all of the Dark Lord's Horcruxes and then kill the Dark Lord himself. He eventually comes to Hogwarts to find the last Horcrux he needs to destroy. In the end he sees Voldemort murder Snape and discovers that Snape was only pretending to support Voldemort and had actually secretly been on the anti-Voldemort side the whole time. Harry manages to kill Voldemort at the end of the book.