Harry Potter and the Prisoner of Azkaban

A fantasy novel published in 1999, the third book in the Harry Potter series. This year, Harry learns about the escape of the dangerous prisoner Sirius Black, believed to be a supporter of Voldemort. Dementors, the prison guards capable of draining happiness, are stationed at Hogwarts, and Harry is particularly affected by their presence. As he uncovers the truth about his past, the betrayal of his parents, and Sirius’s real role, he and his friends use a Time-Turner to save Black from an unjust fate.