"Washington, D.C., 1958: Grace Feldman is hiding a dangerous secret in her home -- not to mention countless others in her head. Grace, a would-be Shakespeare scholar with no mathematical background, learns the art of codebreaking on the fly and becomes one of the country's most potent secret weapons, decrypting intercepted messages during World War I, Prohibition and World War II. From her own father to her mad and mercurial first boss, from Army...