Harry Potter and the Prisoner of Azkaban
Book 3
By: J.K. Rowling
For twelve long years the dreaded fortress of Azkaban held an
infamous prisoner named Sirius Black. Convicted of killing thirteen people with a single curse, he was said to be the heir apparent to the Dark Lord, Voldemort.
To order Harry Potter and the Prisoner of Azkaban
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Now he has escaped, leaving only two clues to where he might be headed: Harry Potter's defeat of You-Know-Who was Black's downfall as well. And the Azkaban guards heard Black muttering in his sleep, "He's at Hogwarts ... he's at Hogwarts." Harry Potter isn't safe, not even within the walls of his magical school, surrounded by his friends. Because on top if it all, there may well be a traitor in their midst.
This summary from inside cover of Harry Potter and the Prisoner of Azkaban.
