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
Harry Potter and the Philosopher's Stone have published translations in Latin and in Ancient Greek, and the latter was described as "one of the most important pieces of Ancient Greek prose written in many centuries". Philip Nel highlighted the influence of Jane Austen, whom Rowling has greatly admired since the age of twelve. Both novelists greatly encourage re-reading, because details that look insignificant foreshadow important events or characters much later in the story-line – for example Sirius Black is briefly mentioned near the beginning of "Harry Potter and the Philosopher's Stone", and then becomes a major character in the third to fifth books. Like Austen's heroines,