The Lost Symbol by Dan Brown
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. Set within the hidden chambers, tunnels, and temples of Washington, D.C., The Lost Symbol is an intelligent, lightning-paced story with surprises at every turn—one of Brown's most riveting novels.