Directed by Alfonso Cuarón. Harry Potter's third year sees the boy wizard, along with his friends, attending Hogwarts School once again. Professor R. J. Lupin joins the staff as Defence Against the Dark Arts teacher, while convicted murderer Sirius Black escapes from Azkaban Prison. The Ministry of Magic entrusts the Dementors of Azkaban to guard Hogwarts from Black. Harry learns more about