"Chamber of Secrets" is the second book in the Harry Potter series by J.K. Rowling. It follows Harry Potter as he returns to Hogwarts School of Witchcraft and Wizardry for his second year. Strange events occur, including students being petrified, leading to the discovery of a hidden chamber within the school. The story revolves around the legend of the Chamber of Secrets, said to house a monster that can only be unleashed by the heir of Salazar Slytherin. Harry, along with his friends Ron Weasley and Hermione Granger, investigates the mystery and ultimately confronts the monster to save their school.