Before dying murdered Jacques Saunière, the last Grand Master of a secret society that dates back to the founding of the Templars, transmitted to her granddaughter Sofia a mysterious key. Saunière and his predecessors, among them men like Isaac Newton and Leonardo Da Vinci, have maintained for centuries a knowledge that can completely change the history of mankind. Now Sofia, with the help of symbology expert Robert Langdon, begins the search for such secrecy.