Wolfgang, a ten-year-old boy with an IQ of 152 and autism spectrum disorder, is forced to live with his father Carles, whom he has never seen, after the sudden death of his mother.

　　A couple on the verge of a nasty divorce attempt to sell their empty love nest and move on with their lives, separately. After a successful open house they are horrified to discover, days later, that a potential buyer didn't leave their home. While Alice is being held captive in the basement, the unannounced house guest moves in upstairs. She senses her capture is being kept a rebellious secret. She knows her way only way out if she can only get out alive.

 美國西部某個小鎮(zhèn)，警長富蘭克林·亨特（庫爾特·拉塞爾 Kurt Russell 飾）夜晚射傷了一名可疑的流浪漢，隨后他請來小鎮(zhèn)醫(yī)生薩曼莎（莉莉·西蒙斯 Lili Simmons 飾）為嫌疑人治療。夜深人靜，一名馬夫遭到神秘入侵者殘忍殺害，而嫌疑人和薩曼莎也消失無蹤。富蘭 克林深感事態(tài)嚴重，他召集薩曼莎的丈夫亞瑟·歐·德懷爾（帕特里克·威爾森 Patrick Wilson 飾）以及其他村民們在當?shù)鼐起^開會，進而得知昨晚的事可能是一個神秘的穴居人所為。這群野蠻人近親通婚，甚至會吃掉包括親生母親在內的人類。雖然兇險無比，富蘭克林以及其他勇士決心勇闖穴居人的老巢，救回被綁架的村民，這次征程兇多吉少……