Harry Potter and the Prisoner of Azkaban by J.K. Rowling
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!

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