一对名为阿德莱德和盖博的夫妻带着孩子到海滨度假，这里曾经是阿莱德莱童年的娱乐场所。在海滨与泰勒一家玩了一天之后，阿德莱德愈发地无法从往昔的伤痛中走出，他越来越觉得自己的家庭将要发生灾难。到了晚上，他们一家甚至看到有四个人手拉手在行车道上站立，似乎有更多诡异的事情等待着他们。In order to get away from their busy lives, the Wilson family takes a vacation to Santa Cruz, California with the plan of spending time with their friends, the Tyler family. On a day at the beach, their young son Jason almost wanders off, causing his mother Adelaide to become protective of her family. That night, four mysterious people break into Adelaide's childhood home where they're staying. The family is shocked to find out that the intruders look like and talk like them, only with grotesque appearances.