导演TJ正在导演一部科幻片《火星坏女孩》，但是却很不顺利，请来的女主角不是被杀就是失踪。一时间人心惶惶，没有人敢出演女主角。制片方最后不得不请来色情小说作者艾曼纽担当主演，开始重新拍摄。但是凶杀并没有结束，相反这次凶杀的魔爪不只是伸向了艾曼纽，剧组的其他人员也命悬一线...

Based on actual events of American serial killer Edmund Kemper, who murdered his grandparents at age 15 and, after being paroled for that crime, killed eight women in 1972 and 1973 including his own mother.