20岁的德蕾娅，她在自己梦想去的大学的一位教授家里做了份保姆的工作，为了跟教授的两个孩子——特里西和杰克打成一片，她带上自己的弟弟菲利普，和两个孩子去徒步旅行，却不知道有神秘的外星生物已经降临地球，并开始威胁到他们的安危....
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