Magic in Harry Potter extraordinarily high turnover of staff members—throughout the series no Defence Against the Dark Arts teacher has retained the post for more than one school year. Harry is exceptionally skilled in this subject. During the period the story takes place, the class is taught by Quirinus Quirrell (book one), Gilderoy Lockhart (book two), Remus Lupin (book three), Bartemius Crouch Jr impersonating Alastor "Mad-eye" Moody (book four), Dolores Umbridge (book five), Severus Snape (book six), and Amycus Carrow (book seven). Hagrid suggests in "Harry Potter and the Chamber of Secrets" that ""They're startin' ter think the job's jinxed. No one's lasted long
Harry Potter and the Philosopher's Stone Potter and the Order of the Phoenix" is the longest book in the series at 766 pages in the UK version and 870 pages in the US version. It was published worldwide in English on June 21, 2003. "Harry Potter and the Half-Blood Prince" was published on July 16, 2005 and sold 11 million copies in the first 24 hours of its worldwide release. The seventh and final novel, "Harry Potter and the Deathly Hallows", was published on July 21, 2007. The book sold 11 million copies within 24 hours of its release: 2.7 million copies in the UK and