Harry Potter and the Prisoner of Azkaban

Harry's third year at Hogwarts begins under a shadow. A notorious prisoner has escaped from the wizard prison of Azkaban, and the guards sent to protect the school unsettle Harry more than anyone. As he studies new subjects and makes surprising new acquaintances, he learns more about his parents and the people who were close to them. The book is darker and more complex than its predecessors, with a clever plot built around time and trust. Many readers regard it as a turning point, where the series grows in emotional depth.