电影根据布洛克｀科尔的青年成人小说改编，讲述一男一女两名小孩在夏令营遭到恶作剧，被选成“山羊”，在夜晚被剥光衣服并留在了一座小岛上。由于重回夏令营可能遭到羞辱，因此两个小孩决定离开，展开了三天的自我发现之旅。他们徘徊于一座小镇，躲开怀疑他们的大人，尤其是警察，试图找到一些衣服、食物和暂住之处。渐渐的，男孩和女孩发现他们宁可自己生活，即使他们的父母表示愿意前来营救⋯⋯Based on one of the most beloved Young Adult novels of all time: Two kids are stripped naked and left together on an island in a lake - victims of a vicious summer camp prank; But rather than have to return to camp and face the humiliation, they decide to take off, on the run together. What follows is a three day odyssey of discovery and self-discovery.