12-year-old friends, Marshall, Gilbert and Amy accidentally revive a mummy they discover in a neighbor's basement. They affectionately name the mummy Harold, and must rush to return him to his resting

《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，原剧中的两个中心角色Millie和Jean分开美国，与两个美国密码破译专家共同调查新发作的谋杀案