The Priory of Sion and the Da Vinci Code
I really enjoyed reading the Dan Brown book, The Da Vinci Code. A well written and suspenseful novel that you can't put down. The book has also gained a lot of attention because of the "Fact" section which asserts that much of the elements used in the book are true. Unfortunately, to paraphrase George Orwell, some facts are more factual than others and the "Priory of Sion" is one of the less factual of the facts.
Massimo Introvigne is an Italian professor of religion who maintains an excellent site on religious matters. He regularly writes articles and recently added a FAQ about the Da Vinci Code that exposes the truth about Pierre Plantard, his Priory of Sion and a few other things: The Da Vinci Code FAQ, by Massimo Introvigne
Ah, well, not to worry it's still a great book.