As Harry Potter readies himself for his third year at Hogwarts, an incident in which he is unable to control his anger forces him on the lam. At the same time, a dangerous man named Sirius Black escapes from the Azkaban prison with one thought on his mind: to track down and kill Harry Potter. The third year at Hogwarts is full of excitement and danger for Harry and his friends Ron Weasley and Hermione Granger.