Harry Potter and the Prisoner of Azkaban is the third book in the record-breaking series. News reports of a murderer who recently escaped from Azkaban have everyone on edge and young Harry Potter is warned that Sirius Black may come looking for him, but as he gets closer and closer to Hogwarts, the history between Sirius Black and Harry's parents unravels. A magical story of trust, friendship, and not always believing the first thing you hear to be true. For twelve long years, the dread 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.Now he has escaped, leaving only two clues as 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 of it all, there may well be a traitor in their midst.