There are some things that were kept.
Certain things that must always stay hidden.
there are also things that were meant to be---found.
Harvard Professor and Symbologist Robert Langdon was thrown into another case when the Louver curator and a Priory of Sion Grand Maste Jacques Sauniere was shot at the Museum. According to the man who shot him, he is working for a man named "Teacher", who was looking for the "keystone". An important item crucial in search of the holy grail. Robert Langdon was then summoned to decode the cryptic message that was left before the curator died.
Under suspicion of the estranged granddaughter of the murdered man, Sophie Neveu. She and Robert Langdon decode the messages that leads them place to place that will somehow lead them to the holy grail---with the police hot on their trails.
What will become of them?
What were the clues all about?
Can they find the holy grail?
Will they find the culprit who wants the holy grail?
What secret that was hidden that is now to be discovered?
"Men go to far greater lengths to avoid what they fear than obtain what they desire."