The third instalment in the phenomenally successful Harry Potter series. Harry (Daniel Radcliffe), Ron (Rupert Grint) and Hermione (Emma Watson) have returned to Hogwarts for their third year, but there is a shadow hanging over Harry: dangerous serial killer Sirius Black (Gary Oldman) has escaped from the Wizards' prison, the Azkaban Fortress - and he wants revenge for the death of his master, Voldemort, who Harry defeated 13 years earlier. For Harry's protection, Azkaban has sent an army of soul-sucking Dementors to guard Hogwarts from a possible attack by Black - but they turn out to be as much of a threat to Harry as Black himself. As myth, magic and teenage hormones combine to weave their dark spell, Harry uncovers a few more crucial secrets about his mysterious past. The supporting cast includes Emma Thompson, Michael Gambon, Alan Rickman, Julie Walters, Maggie Smith, Robbie Coltrane, David Thewlis and Timothy Spall.