SPOILER: sent in by Dallas E.
This book sees the return of Robert Langdon, an ancient symbols professor, from Brown's earlier book Angel's and Demon's. In this book Langdon is paired up with a beautiful French Police Cryptologist who happens to be the estranged granddaughter of the recently murdered Head of the French museum the Louvre.
As the murdered fellow is dying he leaves some clues behind to a secret that he, along with three other men, has been charged with keeping.
The secret has been kept hidden for two thousand years. Langdon, along with his new Woman friend follow clues hidden within Leonardo Da Vinci art and papers.
The secret? That Jesus Christ not only was married to Mary Magdalene, but that they produced a child. The clues that Langdon follows eventually leads him to find the resting place for the remains of Mary Magdalene, under an inverted Pyramid of glass that resides in front of the Louvre
I really liked the book and immediately went out and found the rest of Dan Brown's books and read them. I can say that I really like his writing, I don't care if a lot of things are controversial. It's Fiction people!