Azkaban

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 Potters 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 isnt 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.....