A Sheriff is awakened by his daughter, alerting him of a prowler on their ranch. As father and daughter head out into the woods to track the prowler down, they soon discover they're dealing with something that isn't human.

当Phil Walden游荡在他荒芜家乡的街道上时，童年记忆中的夏日又回来了。这个夏日他在成长。这个夏日陌生人来到了镇上。陌生人 Eli 的到来打破了镇民平静的生活。两个男孩对他的秘密充满了好奇。Eli 要重新唤醒这个小镇的活力时，孩子们成了他的左膀右臂。用他那老式照相机记录着小镇生活的点点滴滴。但是，Eli 不断的拍摄使他们改变了对小镇的认识。当孩子们认识到自己身处世界的真实本质时，稚嫩的好奇转变成了绝望。这种认识加上Eli 隐藏的真实目的威胁到了整个城镇的存在。