WASHINGTON, DC: Harvard University symbologist Robert Langdon is invited at the last minute to give an evening talk at the Capitol. But, moments after his arrival, something disturbing is discovered in the center of the Rotunda, something terrifyingly encoded by five mysterious symbols. Langdon knew it was an ancient invitation that would lead its recipient to a secret, lost mystical wisdom. When Langdon's revered mentor Peter Solomon, philanthropist and prominent freemason, is kidnapped, Langdon realizes that his only hope of saving his friend's life is to accept the mysterious invitation, wherever it leads him. Events quickly swept Langdon behind the facade of the most important historic city in America, through the secret chambers, structures, and tunnels in it. Everything familiar turns into the mysterious and secretive world of a masterfully hidden past, in which Masonic secrets and unprecedented discoveries seem to lead him to one incredible truth.