Ben and his wife Jules are in for a surprise when they inherit an abandoned coastal property that Ben's recently deceased mother never told them about. Untouched for 40 years the house looms like an eerie relic over land which includes a stunning private cove and beach. The beauty and tranquility of the place leave the family with the nagging question: why was this property kept a secret for so long? While Jules rummages through the house looking for answers, Ben goes to repair the buried water tank, not knowing that in doing so he is unleashing a long-dormant creature, fiercely protective of its environment.

一对感情疏离的姐妹终于重聚，姐姐艾莉（阿丽莎·萨瑟兰 Alyssa Sutherland 饰）意外被恶魔附体，妹妹贝丝（莉莉·沙利文 Lily Sullivan 饰）和她的外甥女们为生存展开反击。

一次灾难性事件毁灭了文明，数千年后，人类已经适应，并进化出了新的生存方式。如今，巨大的移动城市在地球上漫步，无情地吞噬着小牵引城镇。汤姆·纳茨沃西（罗伯特·席安饰），来自大牵引城市伦敦的低层，在遭遇了危险逃犯海特·肖（海拉·希尔莫饰）后，不得不开始为生存而奋战。两个截然相反，本不该相遇的人，却意外结盟，他们注定将改变未来。