It’s Harry’s third year at Hogwarts, but a shadow hangs over the school (Hogwarts). A dangerous mass murderer, Sirius Black, has escaped the Azkaban Fortress – the Wizards Prison – and everyone believes he is coming to kill Harry. While learning to cope with the Dementors sent to protect Hogwarts, Harry learns about the disturbing story of Sirius Black and his close connection to Harry’s family. This story twists and turns with many surprising revelations.