Two estranged brothers come together and discover old family secrets after inheriting their grandfather's property. As their friends start to go missing, they fear they are being stalked by a creature lurking in the shadows.

故事的布景设定在一个大部分人类已经死亡的末日世界中，主宰着这个世界里的生杀大权的，是那些变异了的冷血动物。仅剩的人类为了求生被迫迁上全国堡垒中，整天生存在惶惑不安里。　　乔伊（迪伦·奥布莱恩 Dylan O'Brien 饰）在七年前的大多难害里同女友艾米（杰西卡·亨维克 Jessica Henwick 饰）走散，如今他们身居两个差此外地堡中，靠着无线…