Harry Potter the Prisoner of Azkaban

On the morning of his thirteenth birthday, Harry Potter learns that mass-murderer Sirius Black has escaped the iron grasp of Azkaban fortress. Harry has barely survived his first two years at Hogwarts; now it looks as though Sirius Black is determined to make sure Harry doesn't finish his third.
With Ron and Hermione at his side, Harry is forced to confront this new enemy - while the sinister Dementors of Azkaban patrol the school grounds threatening to suck the very soul from those who they encounter with a deadly kiss...