The story starts off with the murder of Jacques Saunière (the Grand Master Of Priory of Sion, although virtually no one knows that at the time) by Silas (acting on behalf of someone known only as The Teacher) to extract the location of the "keystone", an item that leads to the Holy Grail. The police summon Robert Langdon, who is delivering a lecture in Paris, to the murder scene and ask for his help in deciphering the code Sauniere left on and near his body. Bezu Fache, the Captain of the Central Directorate Judicial Police, believes Langdon is the prime suspect in the murder.Sophie Neveu shows up at the murder scene as a police cryptographer and quickly gains Langdon's trust. Jacques Saunière was Neveu's grandfather and they were very close to each other until she discovered him participating in a pagan sex ritual (Hieros Gamos) at his home in Normandy, when she made a surprise visit there during a break from boarding school. (That she had observed something is mentioned and hinted at several times throughout the story, but what it is that she saw is revealed to no one, including the reader, until near the end when she tells Robert). Surprised by this Sophie decides to investigate heavily into her grandfather’s case.
The book has an intriguing mystery style that only Dan Brown is capable of. He makes the mystery based on facts, by using knowledge that no average reader would know. An example is the scene when they use the Fibonacci sequence to translate the Da Vinci Code. Majority of viewers seem that people either passionately love this book or they passionately hate it, based on religious experiences. For my part, I don't see the book so much as an indictment of the Catholic Church in particular but of religious extremism and religion interfering in political process in general. The unwarranted political control granted to extreme religious organizations like the CBN is an issue that we will be forced to address one way or the other. It appeared to me that...