For twelve long years, the dread fortress of Azkaban held an infamous prisoner named Sirius Black. Convicted of killing thirteen other people with a single curse, he was once said to be the heir apparent to the Dark Lord, Voldemort.
Now he has escaped, leaving only two clues as to where he may well be headed: Harry Potter’s defeat of You-Know-Who was once Black’s downfall as well. And the Azkaban guards heard Black muttering in his sleep, “He is at Hogwarts . . . He is at Hogwarts.”
Harry Potter is not protected, not even inside the walls of his magical school, surrounded by his friends. Because on top of it all, there could be a traitor of their midst.