影片延续前作剧情，故事从“小丑”亚瑟（华金·菲尼克斯 饰）被捕后展开，他在狱中等待着审判日的到来。然而，就在亚瑟与自己的双重人格缠斗之时，他不仅偶遇真爱，甚至还释放出一直潜藏在内心的旋律。

While traveling out to the desert for a shoot, Monte Ashcroft a world class editorial photographer meets his new muse in Dakota Thompson, a local server at a desolate diner. Their connection is instant and profound, with the exception of one big secret.