Harry Potter and the Prisoner of Azkaban

J.K. Rowling's third book opens with Harry Potter enduring another unhappy summer at the Dursleys'. One day, Harry overhears a news report about escaped convict, Sirius Black. When Uncle Vernon's sister, Marge, viciously insults Harry, his anger causes her to inflate and float to the ceiling. Upset, Harry runs away. On a dark street, he sees a large black dog ominously watching him from the bushes, but the Knight Bus suddenly appears and takes him to Diagon Alley. During the trip, Harry learns that Black murdered thirteen people with one curse and is a supporter of Lord Voldemort. He is met by Minister for Magic, Cornelius Fudge, who Harry is certain will expel him from Hogwarts for using under-age magic. Surprisingly, the matter is dropped. While staying at the Leaky Cauldron, Harry hears Mr. and Mrs. Weasley arguing over whether he should be warned about Black.

There are a few changes at Hogwarts as Harry begins his third year. For one, Hermione is taking nearly twice as many classes, including some taught at the same time. In addition, two new teachers join the staff: Professor Remus J. Lupin for Defence Against the Dark Arts and Rubeus Hagrid for Care of Magical Creatures. While Lupin's lessons are enjoyable, Hagrid's soon become dreary. During the first class, Draco Malfoy deliberately provokes the hippogriff Buckbeak, a half-horse, half-bird creature, into attacking him. Draco's father, Lucius Malfoy, files a complaint against Hagrid.