The Rule of Four
Ian Caldwell, Dustin Thomason
Princeton students decode a Renaissance text full of hidden messages, offering the same pleasure of cracking layered puzzles that Langdon faces, with a more academic, campus setting.
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by Dan Brown
THE #1 WORLDWIDE BESTSELLER FROM THE ICONIC AUTHOR OF THE DA VINCI CODE AND THE NEW ROBERT LANGDON THRILLER, THE SECRET OF SECRETS “Impossible to put down.” —The New York Times “Thrilling and entertaining, like the experience on a roller coaster.” —Los Angeles Times Famed Harvard symbologist Robert Langdon answers an unexpected summons to deliver a lecture 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 a terrifying enemy. Look for more Robert Langdon novels: The Da Vinci Code Inferno Origin The Secret of Secrets
Book details and cover from Google Books.
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Ian Caldwell, Dustin Thomason
Princeton students decode a Renaissance text full of hidden messages, offering the same pleasure of cracking layered puzzles that Langdon faces, with a more academic, campus setting.
Steve Berry
Cotton Malone chases Knights Templar secrets across Europe, delivering the hidden-history treasure hunt and constant pursuit fans of Langdon's Masonic quest will recognise.

Brad Meltzer
Set around the White House, it threads Masonic symbols and a Thomas Jefferson code into a modern conspiracy, much like The Lost Symbol's Washington, D.C. puzzles.

Steve Berry
A cipher tied to the Founding Fathers and presidential assassinations sends the hero through American landmarks, echoing the capital-city mysteries Langdon unravels.