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Harry Potter and the Prisoner of Azkaban is a fantasy novel written by British author J. K. Rowling. It is the third installment in the Harry Potter series. The novel follows Harry Potter, a young wizard, in his third year at Hogwarts School of Witchcraft and Wizardry. Along with friends Ron Weasley and Hermione Granger, Harry investigates Sirius Black, an escaped prisoner from Azkaban, the wizard prison, believed to be one of Lord Voldemort’s old allies.