Dan Brown

Just read Angels and Demons. His take on history and secret societies is intriguing, to say the least. Would love to learn more about The Illuminati, Bernini, Masonry and the lot.
However, the book seems to be full of inaccurate facts in spite of his claim that everything is factual in his book. He claims in his webpage

If you read the "FACT" page, you will see it clearly states that the documents, rituals, organization, artwork, and architecture in the novel all exist. The "FACT" page makes no statement whatsoever about any of the ancient theories discussed by fictional characters.

So, it is definitely left to the reader whether to take the "facts" with a pinch of salt or not.
In spite of this i cant help seeking attention to the inumerable mistakes he has made which can be misleading to the readers. Check out this sitewikipedia and this blog