#1 WORLDWIDE BESTSELLER • An intelligent, lightning-paced thriller set within the hidden chambers, tunnels, and temples of Washington, D.C., with surprises at every turn. "Impossible to put down.... Another mind-blowing Robert Langdon story." -The New York TimesFamed 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.