Its a dark time again at Hogwarts witchcraft and wizardry for Harry Potter (Radcliffe) and his friends, Ron Weasley (Grint) and Hermione Granger (Watson), as they start their third year. Sirius Black (Oldman), who is believed to have helped in the kidnapping of Harrys parents, have escaped from Azkaban prison. Dementors are everywhere, keeping a lookout for Black. Life is still not that bad, that is, until the Fat Lady (French) reports that Sirius Black is in the castle. Whatever Harry Potter does now, he will always need tread carefully and watch his back.