Based on a true story, this historical novel introduces Grace Smith—an unconventional woman in the early twentieth century who escapes her small-town Indiana life for a shot at something more. An eccentric millionaire hires her to learn codebreaking, and soon she's catching spies, rumrunners, and war criminals. Lady Codebreaker offers an exhilarating glimpse of the creation of the US government's cryptanalysis unit, and a thrilling story of a smart woman making her own way in a male chauvinist world.