The Lost Symbol By Dan Brown

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.