Harvard symbologist Robert Langdon is unexpectedly asked to deliver an evening lecture in the U.S. Capitol building. Within minutes of his arrival a disturbing object, encoded with five symbols, is discovered in the building. Langdon recognizes the object as an ancient invitation into a long-lost world of esoteric wisdom. When his friend and mentor, Peter Solomon, is kidnapped, he realizes that the only hope of saving his friend is to accept the invitation, and is instantly plunged into a world of Masonic secrets, hidden history, and never-before-seen locations that seem to be dragging him toward an inconceivable truth. --