Harry goes into the Chamber of Secrets and finds Ginny, who has been captured by the ghost of Tom Riddle, who is the younger version of Lord Voldemort. It turns out that the book Draco's father gave to Ginny was the diary of Tom Riddle and she was the one who accidentally opened the Chamber. Tom Riddle tries to kill Harry with a gigantic snake called the Basilisk. Harry kills the snake with a sword and destroys the diary, which causes the ghost of Tom Riddle to disappear.