It's supposed to be a fresh start One year after the loss of her husband, Nicole settles with her young adult children Justine and Jason in Purity Falls. First, the family is greeted by a warm welcome. Especially their rich neighbor Courtney seems awfully nice, quickly setting up Jason with odd jobs to support the family income. Yet Nicole soon notices that something is amiss, with her son leaving and coming back at suspiciously late hours. When a young neighbor drowns in a pool, things start to get dangerous. Something is not right with the oh-so-friendly Courtney, who seems to have a grip on her son. Soon, Nicole uncovers the criminal underbelly of Purity Falls' wholesome suburban facade that will threaten all of their lives.

尼克·班尼斯特（休·杰克曼 饰）是一名私家侦探。他的工作主要是帮助客户重拾遗忘的记忆，沉湎于幽暗诱人的逝去时光。尼克生活在因海平面上升而已经半淹没的迈阿密，然而当他接手了新客户梅（丽贝卡·弗格森 饰）之后，他的生活永远改变了。一次简单的寻回失物之任务，演变成一出危机重重的惊天迷局。尼克努力寻找着梅的失踪真相，而与整座城市存亡息息相关的巨型阴谋也逐渐浮现。他必须争分夺秒，破解回忆迷局，但他真的能在阴谋将自己吞噬前，找到梅失踪的真相吗？同时尼克也必须直面一个终极难题：为了留住你最爱的人，你到底愿意付出什么？