Harry Potter and the Half-Blood Prince continue. Harry finds out that the locket is not the real Horcrux, containing only a note from someone named "R. A. B.". Harry is so devastated by Dumbledore's death (and upset by its futility) that he tells his friends he will not be returning to Hogwarts. Instead, he will spend the next year searching out Voldemort's Horcruxes. Ron and Hermione insist on joining him in destroying Lord Voldemort for good. "Harry Potter and the Half-Blood Prince" is the sixth book in the Harry Potter series. The first book in the series, "Harry Potter and the Philosopher's Stone", was first published
Harry Potter and the Half-Blood Prince US on 8 September 1999. "Harry Potter and the Goblet of Fire" was published on 8 July 2000 at the same time by Bloomsbury and Scholastic. "Harry Potter and the Order of the Phoenix", the longest novel in the Harry Potter series, was released 21 June 2003. After the publishing of "Harry Potter and the Half-Blood Prince", the seventh and final novel, "Harry Potter and the Deathly Hallows", was released 21 July 2007. The book sold 11 million copies within 24 hours of its release: 2.7 million copies in the UK and 8.3 million in the US. Rowling stated that