When the curator of the Louvre in Paris is found murdered in his own museum, an American professor of symbology and the victim's grand-daughter find themselves in the middle of a struggle for survival between a radical and desperate Catholic sect and an ancient secret society sworn to protect the Holy Grail. What is most intriguing about conspiracy theory novels is that it is hard to tell where historic fact ends and fiction begins. I have doubts for example about Leonardo Da Vinci having invented public key cryptography. But for what little I know about art and history, he could have been the head of a secret society and hidden a lot of subversive jokes and messages in his pictures. I have to check the Mona Lisa and the Last Supper more carefully when I have a chance to see them again.