Harry Potter has to sneak back to Hogwarts, after accidentally inflating his horrible Aunt Petunia. But once there everyone is whispering about a prizoner who has escaped from the famous wizard prizon, Azkaban. His name is Sirius Black, and as a follower of Lord Voldemort he is determined to track Harry Potter down - even if it means laying siege to the very walls of Hogwarts!

In one of the most hotly anticipated sequels in memory, J.K. Rowling takes up where she left with Harry s second year at the Hogwarts School of Witchcraft and Wizardry. Old friends and new torments abound, including a spirit named Moaning Myrtle who haunts the girl s bathroom, an outrageously conceited professor, Gilderoy Lockheart, and a mysterious force that turns Hogwarts students to stone.

Harry Potter has never played a sport while flying on a broomstick. He's never worn a Cloak of Invisibility, befriended a giant, or helped hatch a dragon. All Harry knows is a miserable life with the Dursleys, his horrible aunt and uncle, and their abominable son, Dudley. Harry's room is a tiny cupboard under the stairs, and he hasn't had a birthday party in ten years.
But all that is about to change when a mysterious letter arrives by owl messenger: a letter with an invitation to a wonderful place he never dreamed existed. There he finds not only friends, aerial sports, and magic around every corner, but a great destiny that's been waiting for him... if Harry can survive the encounter.