But if Harry has learned anything from his education in wizardry, it is that things are often not what they seem. Yet despite the relative safety of life at Hogwarts and the best efforts of the dementors, the threat of Sirius Black grows ever closer. And he becomes close with the new Defense of the Dark Arts teacher, who was a childhood friend of his father. A cute fourth-year student catches his eye.

A top-of-the-line broom takes Harry's success at Quidditch, the sport of the Wizarding world, to new heights. Meanwhile, life continues as usual at Hogwarts.

But Harry can't imagine that Sirius - or, for that matter, the evil Lord Voldemort - could be more frightening than the dementors themselves, who have the terrible power to fill anyone they come across with aching loneliness and despair. Now Hogwarts is being patrolled by the dementors, the Azkaban guards who are hunting Sirius.

A convicted murderer, Sirius Black, has broken out of Azkaban prison, and it seems he's after Harry. Harry Potter's third year at Hogwarts is full of new dangers.