凯伦•特尼（Lori Heuring 饰）的丈夫长久以来饱受病痛折磨，最终不治身亡。失去经济来源的凯伦，只好带着两个女儿：莎拉（Scout Taylor-Compton 饰）和艾玛（Chloe Moretz 饰）搬到宾西法尼亚州艾迪镇的卡顿矿山，一幢在她丈夫名下的房子里居住。 　　本想逃避伤心往事平淡地生活，然而厄运却挥之不去。卡顿矿山1913年的时候，曾发生过一起严重的瓦斯爆炸事故，许多幼小的童工被活埋于此，从此幼童的恶灵便徘徊附近，报复加害人类。不久，艾玛神秘消失，凯伦不愿再失去女儿，她和莎拉踏上了寻找艾玛的险恶路途……In 1913, in Carlton Mine, Addytown, Pennsylvania, the cruel owner of a mine uses poor children in the exploration and after an explosion, a group of children is buried alive. On the present days, Karen Tunny has just lost her husband after a long period of terminal disease when the family savings have been spent in the treatment. Without any money, she moves with her daughters Sarah and Emma to an old house in the mountains that belonged to her husband. Karen is advised by her neighbors to stay at home in the night, and Sarah hears that there are zombies in the area. When Emma becomes friend of Mary, he mother believes she is an imaginary friend. However, when Sarah's friends are attacked and eaten alive by zombie children and Emma vanishes, Karen and Sarah chase her nearby the mine.