Harry Potter and the Chamber of Secrets is the second film in the popular Harry Potter films series. It seems that someone has opened the mysterious Chamber of Secrets, letting loose the monster and all its calamitous powers. As Harry, Ron, and Hermione set out to find the secret chamber and slay the beast, speculation is rife that one of the heirs of Salazar Slytherin, the co-founder of the school, opened the chamber as a warning against the presence of "mudbloods" at the school.