The Chamber of Secrets (Rowling, 1999a)

The second sequel starts with the letter from Hogwarts which allows students to come back to Hogwarts since the new semester starts. Instead of an invitation letter, Dobby, a house elf, warns Harry not to go back to school to keep his life safe. During the second year of Hogwarts, sinister writing appears on the walls, students are attacked, and the Chamber of Secrets which is supposed to be closed becomes open. Moaning Myrtle, one of the ghosts in Hogwarts, and Hermione become the victim of the Basilisk, the monster snake who turns victims into stones when they have eye contact with it. The unique talent of Harry to understand and speak the language of snakes [Parseltongue] gives him the clue of how to enter the Chamber of Secrets. Harry explores the Chamber of Secrets and kills the Basilisk with the sword of Gryffindor delivered by a phoenix. Harry destroys the diary of Tom Riddle, the young Voldemort, which charmed and kidnapped Ginny, Ron’s younger sister. Then Harry encounters Tom Riddle and defeats him.