Harry and his friends return for their sixth year at Hogwarts School of Witchcraft and Wizardry. Harry is convinced that Malfoy is up to something sinister, and that Professor Snape is also involved. Meanwhile, evil Voldemort's power increases daily, and Harry encounters a mysterious prince in the pages of his potions textbook. Some descriptions of violence. Grades 4-7 and older readers. Sequel to "Harry Potter and the Order of the Phoenix."