记者 Sydney St. James 正在为她工作的杂志撰写一篇文章，介绍专门研究女性的在线约会机构 Artemis。 她安排了一次采访阿尔忒弥斯的主人安娜，并与她的摄影师山姆一起拜访了这位神秘的女人，山姆对一个名为 Vampire Web 的网站着迷。 Sidney 对 Anna 产生了极大的吸引力，Anna 实际上是一个古老的吸血鬼，名叫 Anastasia。
娜奥米-沃茨在影片中扮演一个名叫玛丽的儿童心理学家，她遭遇了人生中最不幸的事件：丈夫被一场离奇车祸夺去了性命，儿子则因这次灾难变成了植物人。一次偶然的机会，玛丽邂逅了一个叫汤姆的患儿，她将这个诡异的男孩带回家抚养，却因此招来了一连串不可思议的事件。
冷战时，全球两大特工组织——俄罗斯“中心”与英国“圆场”明争暗斗。特工遇害，高层震怒，责成“圆场”挖出“地鼠”。怀疑对象共有5人，即圆场上任“老总”命名的锅匠，裁缝，士兵，穷人，乞丐。其中，金盆洗手的“乞丐”乔治·史迈利(加里·奥德曼 Gary Oldman 饰)本来有重大嫌疑。某日，行动组-剥头皮组头目的彼得·吉勒姆(本尼迪克特·康伯巴奇 Benedict Cumberbatch 饰)与英国内阁办公室谍报总监拉康排除了史迈利的嫌疑，令其重新出山，负责挖出“地鼠”。于是，史迈利开始分别走访故人，调查“圆场”老大阿勒莱恩，裁缝-比尔·海顿(科林·费斯 Colin Firth 饰)，士兵-掌管东欧事务的资深间谍罗埃·布兰德，穷人-后勤部门点路灯组组长托比·伊斯特哈斯。一时间，圆场疑云密布，人人自危，究竟谁才是“地鼠”…… 本片本片根据约翰·勒卡雷的同名小说改编。片名来自英国民间的“鹅妈妈童谣集”。
A group of tired commuters have caught the last train home, ready to hop into their beds for the night. However, their train soon veers off-course and crashes into an abandoned tunnel. The three surviving commuters; withdrawn mother Yi Ling, her son Lucas, and student Janice, are forced to band together and survive the night, as well as avoid the mysterious monster hunting them. Yi Ling still suffers from flashbacks to the car accident that killed her husband and nearly took Lucas` life too. When Lucas is snatched away by the monster, her maternal instincts are tested, and Janice`s ideas of family are challenged as she remembers her difficult relationship with her estranged father. Back at the subway control headquarters, the engineers do their best to make sense of the situation and rescue the survivors.
