这是一部悬疑剧,虚构了四个拥有特殊技能的女人Susan、Millie、Lucy和Jean,她们曾帮助盟军提前取得二战胜利。 战争结束后,她们的生活渐渐平淡。一件凶杀案的发生,引起了她们的注意。During WWII, men and women working at Bletchley Park played a vital role, breaking the codes used by the German military. Nine years later, former codebreaker Susan is a housewife and mother, but she continues to recognize patterns that surround her in everyday life. When a series of women are brutally murdered around London, Susan sees a pattern emerging. However, when a police-search for what Susan believes to be an overlooked victim turns up nothing, she realizes she cannot solve this puzzle alone. Enlisting three former Bletchley Park colleagues: Millie, Lucy, and Jean; Susan knows they have little time to break this code before the killer strikes again.