Foucault's Pendulum

This looks interesting; there'll be a discussion of Umberto Eco's Foucault's Pendulum later this month. I love the description of the book:

To give you a basic idea without ruining the plot, it's basically The Da Vinci Code if it had been written by someone literate, intelligent, with a superb grasp of character and plot, and who had actually bothered to do some original research.

I'll have to re-read it. (HT: EMN.)