The murder of the Louvre's chief curator puts his granddaughter, cryptographer Sophie Neveu (Audrey Tautou), and symbols expert Robert Langdon (Tom Hanks) on the trail of an ancient, mysterious society founded during the time of Christ. As the two unravel coded messages left for them at the scene -- including a treasure map that leads to the Holy Grail itself -- they find themselves entangled in a mystery that takes them from France to England, searching for clues in the very history of Western civilization.