Harry Potter and the Prisoner of Azkaban. Book 3

Harry Potter is lucky to reach the age of thirteen, since he has survived the murderous attacks of the feared Dark Wizard Voldemort three times. But his hopes for a quiet term concentrating on Quidditch are dashed when a maniacal mass-murderer escapes from Azkaban, pursued by the soul-sucking Dementors who guard the prison. It's assumed that Hogwarts is the safest place for Harry to be. But is it a coincidence that he can feel eyes watching him in the dark, and should he be taking Professor Trelawney's ghoulish predictions seriously?