Harry Potter and the Prisoner of Azkaban (3)

Harry can hardly wait for the holidays to end, especially when Vernon's sister announces her visit. Trouble is inevitable, and Harry eventually runs away – much to the concern of the wizarding community, because the dangerous criminal Sirius Black has escaped from prison and is presumably looking for him. Back at Hogwarts, Harry discovers that Black is responsible for the death of his parents. And then Ron's rat starts behaving very strangely.