Harry Potter and the Prisoner of Azkaban attacked by a big black dog, which Harry has seen several times before. The dog drags Ron through a tunnel under the Whomping Willow into the Shrieking Shack. Harry and Hermione follow, and there is a brief standoff when they find Ron with Sirius Black, who has transformed from the dog. Lupin enters, and they explain the situation to Harry and his friends: Lupin is a werewolf, which led to his friends James Potter, Sirius Black, and Peter Pettigrew becoming animagi. Lupin explains that Scabbers is Pettigrew in his animal form; he has been hiding from Black, whom he had
The Magical Worlds of Harry Potter An updated version of "The Magical Worlds of Harry Potter" was published in 2004 by Berkley Books, just before the film "Harry Potter and the Prisoner of Azkaban" was released. Colbert wrote and published "The Magical Worlds of Narnia" in 2005, a guide to the fictional Narnia universe. The Magical Worlds of Harry Potter The Magical Worlds of Harry Potter: A Treasury of Myths, Legends, and Fascinating Facts is a guide to the fictional "Harry Potter" universe, written by David Colbert. It explores the references to history, legends, and literature in J.K. Rowling's "Harry Potter" novels. Colbert conceived the idea