Malfoy's Secret Chamber

In Chapter 12 of Harry Potter and the Chamber of Secrets, Draco Malfoy shares an important secret: there is "a secret chamber under the drawing-room floor" in the Malfoy manor (page 224). The Malfoys have already created havoc with illegal magical items such as Tom Riddle's diary. And with a known close relationship between Lucious Malfoy and Voldemort this secret chamber could possibly be the location of one of Voldemort's hidden Horcruxes.