The DaVinci Code, a mystery novel by Dan Brown, has been on the bestseller list for months, and there's a movie version in the works starring Tom Hanks. The plot is based on claims about Christ, the Church, and organizations within the Church, e.g., Opus Dei, that are wildly inaccurate.
Disregarding the literary merits of Brown's book,* here are links to reviews and articles that highlight some of the misinformation and numerous untruths found in Dan Brown's book: