Famed Harvard symbologist Robert Langdon answers an unexpected summons to appear at the U.S. Capitol Building. His plans are interrupted when a disturbing object - artfully encoded with five symbols - is discovered in the building. Langdon recognizes in the find an ancient invitation into a lost world of esoteric, potentially dangerous wisdom.   
When his mentor Peter Solomon - a long-standing Mason and beloved philanthropist - is kidnapped, Langdon realizes that the only way to save Solomon is to accept the mystical invitation and plunge headlong into a clandestine world of Masonic secrets, hidden history, and one inconceivable truth...all under the watchful eye of Dan Brown's most terrifying villain to date.