Harry potter and the Prisoner of Azkaban

Harry Potter, along with his best friends Ron and Hermione, is about ti start his third year at Hogwarts School of Witchcraft and Wizardry. Harry can´t wait to get back to school after the summer holidays (who wouldn´t if they lived with the horrible Dursleys?). But when Harry arrives at Hogwarts, the atmophere is tense. There´s an escaped mass muederer on the loose, and the sinister prison guards of Azkaban have been called in to guard the school...