I don't really understand the comment above, however I don't really understand why this book, and Brown's books in general, have people so upset. It isn't like someone who actually knows something about history is writing a shocking story revealing the truth about the church.
So, the book is not accurate, not well written, uses far to many adjectives, and tries to make up for its lack by throwing in lots of twists. It was fun to read though, sort of like watching Mystery Science Theater. I'm pretty sure the bad guy was bad enough without adding his perverted sex life to the story. The major weaknesses of the book are plot implausibilities, and a multitude of factual mistakes, which make claims of the substantial knowledge that can be gleaned from this "well-researched" book both astonishing and sad.
Spoilers: (This book has so many twists it makes your head spin)
Harvard symbology professor Robert Langdon finds himself at CERN, a Swiss nuclear research facility, where a scientist has been murdered by someone in the Illuminati. Some antimatter was taken, and is reported to be in the Vatican. Langdon joins the dead scientist's daughter, Vittoria, on a mad dash through some of Rome's most famous landmarks in an effort to find it before the Vatican is leveled.
As one Amazon Customer put it, "Let me tell you this: NOTHING is as it seems, and NOBDY is safe from suspicion. I was absolutely convinced that one character was involved in the conspiracy and BOY was I WRONG."
Overall, I think Brown may want to invest some of that money he is making now into a good editor.