Harry Potter and The Prisoner of Azkaban

Harry Potter and The Prisoner of Azkaban is a sequel to Harry Potter and The Chamber of Secrets. The movie was directed by Alfonso Cuarón. The film opens up with dangerous wizard Sirius Black escaping Azkaban. Everyone believes that he is after Harry Potter. So Hogwarts and Hogsmeade village is guarded by hundreds of Dementors. Harry comes to know that Sirius is his Godfather who betrayed Harry's family to Lord Voldemort. Later with Hermonie and Ron, Harry discovers Sirius was innocent and they help Sirius to escape from Dementors.