When the Knight Bus crashes through the darkness and screeches to a halt in front of him, it s the start of another far from ordinary year at Hogwarts for Harry Potter. Sirius Black, escaped mass-murderer and follower of Lord Voldemort, is on the run ? and they say he is coming after Harry. In his first ever Divination class, Professor Trelawney sees an omen of death in Harry s tea leaves... But perhaps most terrifying of all are the Dementors patrolling the school grounds, with their soul-sucking kiss...