Synopsis-Spending the summer with the Dursleys, Harry Potter meets Dobby, a house-elf who warns him that it is too dangerous to return to Hogwarts. Dobby sabotages an important dinner for the Dursleys, who lock up Harry to prevent his return to Hogwarts. Harry's friend Ron Weasley and his brothers Fred and George rescue him in their father's flying Ford Anglia.
Harry and the Weasley family are joined by Hermione Granger at a book-signing by Gilderoy Lockhart, Hogwarts' new Defence Against the Dark Arts teacher. Confronted by Draco Malfoy, Harry notices Malfoy's father, Lucius, slip a book into Ginny Weasley's cauldron. When Harry and Ron are blocked from entering Platform Nine and Three-Quarters at London King's Cross railway station, they take the flying car to Hogwarts; after crashing into the Whomping Willow breaking Ron's wand, they receive detention.
In detention, Harry hears strange voices and later finds caretaker Argus Filch's cat, Mrs. Norris, petrified beside a message written in blood: "The Chamber of Secrets has been opened, enemies of the heir... beware." Professor McGonagall explains that one of Hogwarts' founders, Salazar Slytherin, supposedly constructed a secret Chamber containing a monster that only his heir can control, capable of purging the school of Muggle-born students. Suspecting Malfoy is the heir, Harry, Ron, and Hermione plan to question him while disguised using forbidden polyjuice potion, which they brew in a disused bathroom haunted by a ghost, Moaning Myrtle.
During a Quidditch game, Harry's arm is broken by a Bludger. Dobby visits him in the infirmary and reveals that he closed the barrier to Platform 9+3⁄4 and made the Bludger chase Harry to force him to leave the school. He also reveals that the Chamber had been opened in the past. When Harry communicates with a snake, the school believes he is the heir. Disguised as two of Malfoy’s friends, Harry and Ron learn he is not the heir, but that his father had told him a Muggle-born girl died when the Chamber was last opened. Harry finds an enchanted diary owned by former student Tom Riddle, who opened the Chamber and blamed another student Rubeus Hagrid leading to his expulsion. When the diary is stolen and Hermione is petrified, Harry and Ron question Hagrid. Professor Dumbledore, Minister of Magic Cornelius Fudge, and Lucius arrive to take Hagrid to Azkaban, but he discreetly tells the boys to "follow the spiders". In the Forbidden Forest, Harry and Ron meet Hagrid's giant pet spider, Aragog, who reveals Hagrid's innocence and provides a clue about the Chamber's monster.
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