As the story opens, Harvard symbologist Robert Langdon is summoned unexpectedly to deliver an evening lecture in the U.S. Capitol Building. Within minutes of his arrival, however, the night takes a bizarre turn. A disturbing object - artfully encoded with five symbols - is discovered in the Capitol Building. Langdon recognizes the object as an ancient invitation - one meant to usher its recipient into a long-lost world of esoteric wisdom. When Langdon's beloved mentor, Peter Solomon - a prominent Mason and philanthropist - is brutally kidnapped, Langdon realizes his only hope of saving Peter is to accept this mystical invitation and follow wherever it leads him. Langdon is instantly plunged into a clandestine world of Masonic secrets, hidden history, and never-before-seen locations - all of which seem to be dragging him toward a single, inconceivable truth.