After much prodding by a friend I read Dan Brown's Lost Symbol and it was good to see him target someone other than the church. I recently read it a second time, to ensure I hadn't missed any subtle nuances.
Much like the Angels & Demons or The Da Vinci Code, conspiracy theorists will have a field day as our symbologist, Robert Langdon, looks into the secrets of the Masons. Runing around Washington DC to ensure the safety of its inhabitance, our protagonist tries to decode the secrets and symbols and solve the mystery presented to him.
My friend and I each had an additional laugh because we each live near a Mason Hall in our respective cities. There are many reviews of this book on the net if you care to read them detail, and even a few spoiler sites to ruin your fun.
If you have liked any of his previous books I would say give this one a browse as well.