A female prisoner is given a special pass for good behavior that allows her to travel outside the prison for a short time. She goes to visit her mother's tomb. On the train, she meets a young man who tries to convince her to run away. She refuses, but they promise to meet in two years when her sentence is finished. However the man fails to appear at the appointed time.
这部心理惊悚题材的影片故事设置在1950年代加州沙漠里的一个与世隔绝的乌托邦式群体当中,讲述一位家庭主妇(Pugh饰)意外地发现了看似平静的生活中的恐怖秘密。