Harry Potter and the Prisoner of Azkaban is the third installment of J. K. Rowling's Harry Potter series. It is a page turner as Rowling keeps the story going tirelessly.
Harry learns how to create a 'patronus' from Professor Lupin which combats the frightening dementors who love nothing more than to suck out every last ounce of a person's soul and happiness. When in trouble, Harry conjures a powerful patronus to scatter a host of dementors.
Quidditch is the sport of choice at Hogwarts and Harry helps the Gryffindor team to victory. He also learns more about his family history, discovering who are enemies and who are friends to him.
Dumbledore sets the rules of Hogwarts and also relaxes them when the breaking of the rules (almost always by Harry, Ron and Hermione) are put into context by the Professor's sagacity. As always, Dumbledore steals the show at the end with his words of wisdom:
"You think the dead we have loved ever truly leave us? You think that we don't recall them more clearly than ever in times of great trouble? Your father is alive in you, Harry, and shows himself most plainly when you have need of him. How else could you produce that particular Patronus? . . . So you did see your father last night, Harry . . . you found him inside yourself."