《布莱切利四人组》的衍生剧，该剧有四个故事，每个故事两集。故事时间设定在1956年，原剧中的两个核心角色Millie和Jean来到美国，与两个美国密码破译专家共同调查新发生的谋杀案。BenCotton扮演命案侦探BillBryce。

　　Kat Emerson could really use a Christmas miracle! The aspiring singer-songwriter may have big dreams, but she has even bigger problems. Treated like a servant by her vain stepmother and self-involved stepsisters, Kat is forced into a dem…