While giving book readings at the 1939 New York World's Fair, mystery writer Dashiell Hammett is approached by Professor Albert Einstein with a serious problem: A letter containing vital secrets has been stolen. To keep the letter from falling into the hands of Nazi spies, Hammett teams up with his old pal, movie star William Powell, following a twisted trail of intrigue and murder. Along the way, they encounter Johnny Weissmuller, Bugsy Siegel, Jack Dempsey, George VI, Eleanor Roosevelt, Enrico Fermi, and a host of scientists, secret agents, thugs, and a mysterious femme fatale. Will Hammett recover Einstein’s letter? Does the fate of the world depend on it? The theme of the New York World’s Fair was the World of Tomorrow, an unprecedented extravaganza of architecture, science, arts, popular culture, and carnival rides. Built on the eve of World War II, few of the optimistic designers realized the storm that was coming.