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.


About the Author:

J.K. Rowling is the author of the seven Harry Potter novels, which have sold over 450 million copies and have been translated into 79 languages, and three companion books originally published for charity. She has also written The Casual Vacancy, a novel for adults, and, under the pseudonym Robert Galbraith, is the author of the Cormoran Strike crime series. In 2016 J.K. Rowling made her screenwriting debut and was a producer on the film Fantastic Beasts and Where to Find Them, a further extension of the Wizarding World and the start of a new five-film series.