Prisoner of Azkanan (Audio cassette)

Harry's ready to start his third year at Hogwarts and this adventure promises to be better than his last. Hermione and Ron are back as well to pursue their studies, and this year they get to travel to a nearby town on the weekends. But Harry can't go on any field trips; he doesn't have a signed permission slip. And not only that, an escaped prisoner from the famous wizard prison, Azkaban, is rumored to be after Harry and everyone wants to keep an eye on him. His name is Sirius Black -- a follower of Lord Voldemort. And he will stop at nothing to find Harry Potter -- even if it means laying siege to the very walls of Hogwarts