Harvard symbologist Robert Langdon, at the U.S. Capitol Building to deliver a lecture, is drawn into a desperate search through the hidden tunnels and temples of Washington, D.C., when his mentor Peter Solomon, a prominent Mason and philanthropist, is kidnapped and the only clue to Solomon's whereabouts lies in an ancient invitation to a long-lost world of esoteric wisdom.

Traces the life of Elizebeth Smith, who met and married groundbreaking cryptologist William Friedman and worked with him to discover and expose Nazi spy rings in South America by cracking multiple versions of the Enigma machine.