Can you recommend a good mystery novel?

Question

I am looking for a mystery novel in the "the butler did it" tradition. The kind of novel usually set in an old mansion often on a "dark and stormy night".

Please keep in mind I'm over 30 so keep the reading level at high school, college or above. Light, bedtime reading is best but any good mystery is welcome.

Answer 1

Digital Fortress- Dan Brown

The Davinci Code also by Dan Brown.