Beautiful, brilliant, and inseparable, Josie and Jack Raeburn live a secluded, anarchic existence in their decaying western Pennsylvania home. The only adult in their lives is their rage-prone father, a physicist, whose erratic behavior finally drives them away. Without a moral compass to guide them, Jack leads Josie into a menacing world of wealth, eroticism, and betrayal. His sociopathic tendencies emerge, and soon Josie must decide which is stronger: the love and devotion she feels for her brother or her will to survive.