Well I bought Dan Brown's "The Lost Symbol" for my birthday, though as yet I haven't begun what I'm sure will be another epic adventure. I want to finish reading David Hewson's "The Garden of Evil" first, so that I can give my full concentration to Dan Brown's work.
However, I invite you to follow this link to The Lost Symbol quiz and see if you can solve the riddles.
Good luck, you will definitely need it unless you 'cheat' by googling everything! I managed to crack 3 of them, but no more.