

Professor Dumbledore, Cornelius Fudge, and Lucius Malfoy come to take Hagrid to Azkaban, but he discreetly tells the boys to "follow the spiders". When the diary disappears and Hermione is petrified, Harry and Ron question Hagrid.

Harry finds an enchanted diary, owned by a former student named Tom Riddle, which shows him a flashback to fifty years before, where Riddle accused Hagrid, then a pupil, of opening the Chamber. At Christmas, Harry and Ron learn that Malfoy is not the Heir, but he mentions that a girl died when the Chamber was last opened fifty years before. When Harry communicates with a snake, something Salazar Slytherin could do, some believe he is the Heir. Their makeshift laboratory is in abandoned toilets haunted by a ghost, Moaning Myrtle. Harry and Ron suspect Malfoy is the Heir, so Hermione suggests they question him while disguised using polyjuice potion. More attacks occur over the course of the year. Professor McGonagall explains that one of Hogwarts' founders, Salazar Slytherin, supposedly constructed a secret Chamber and hid a monster that only his heir can control inside the Chamber, to purge the school of impure-blooded wizards and witches. While serving detention with Lockhart, Harry hears voices and later finds caretaker Argus Filch's cat, Mrs Norris, petrified, and a message written in blood announcing the Chamber of Secrets has been opened and threatening "enemies of the Heir".
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They are allowed back into school but face detention. Ron's wand is damaged, and the car throws them out before driving off. When Harry and Ron are blocked from entering Platform Nine and Three-Quarters, they fly to Hogwarts in the Ford Anglia and crash into the hostile Whomping Willow. Harry also encounters Draco Malfoy and his father Lucius, who slips a book in Ginny Weasley's belongings. While buying school supplies, Harry and the Weasley family encounter Rubeus Hagrid and Hermione Granger, and they attend a book-signing by celebrity wizard Gilderoy Lockhart, who announces he will be the new Defence Against the Dark Arts teacher. The Dursleys lock Harry up, but Ron, Fred and George Weasley rescue him in their father's flying Ford Anglia. Harry chases him downstairs, where Dobby destroys a cake. In his room, Harry meets Dobby, a house-elf who warns him bad things will happen if he returns to Hogwarts, and reveals he intercepted his friends' letters. Harry Potter spends the summer without receiving letters from his Hogwarts friends.
