雷·门罗（萨姆·沃辛顿饰）是一个好心但不堪重负的居家男人。在与岳父岳母度过一个紧张的假日周末后，雷带着妻子乔安妮（莉莉·拉贝饰）和女儿佩里（露西·卡普里饰）开车回家，途中驶入一个休息区。然而屋漏偏逢阴雨夜，佩里在事故中受伤。一家人急忙带着她来到附近一个急诊室，这里的工作人员看似有些意图可疑。被送去做进一步检测后，佩里与乔安妮失踪了，他们所有的访问记录也消失不见。雷的担忧成了真：他必须争分夺秒寻找家人，并搞清他们究竟遭遇了什么。
Driving cross-country, Ray and his wife and daughter stop at a highway rest area where his daughter falls and breaks her arm. After a frantic rush to the hospital and a clash with the check-in nurse, Ray is finally able to get her to a doctor. While the wife and daughter go downstairs for an MRI, Ray, exhausted, passes out in a chair in the lobby. Upon waking up, they have no record or knowledge of Ray's family ever being checked in.
