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?

Harry can't wait for his holidays with the dire Dursleys to end. But a small, self-punishing house-elf warns Harry of mortal danger awaiting him at Hogwarts School. Returning to the castle nevertheless, Harry hears a rumour about a chamber of secrets, holding unknown horrors to magicians of Muggle parentage. Now someone is casting spells that turn people to stone, and a terrible warning is found painted on the wall. The chief suspect - who's always in the wrong place - is Harry. But something much darker has yet to be unleashed.