Harry Potter returns to Hogwarts for his second year, only to be met with terrifying warnings from a mysterious house-elf named Dobby, who claims that a deadly catastrophe is about to unfold. Soon, a series of bizarre, bone-chilling attacks leave students literally petrified, and a historical legend regarding a hidden 'Chamber of Secrets' resurfaces. The school is plunged into absolute panic as rumors spread that the fabled Heir of Slytherin has returned to purge the school of muggle-borns. Harry discovers a strange, sentient diary from the past, leading him and his friends into a dark, subterranean labyrinth to face a legendary, serpentine horror.