7.8动机（1958）
主演：阿尔弗雷德·希区柯克/斯基普·霍梅尔/威廉·雷德菲尔德/卡尔·贝茨/卡门-菲利普斯/凯斯图尔特/肯克拉克/Tharon Crigler/吉姆·约翰逊/加里·克拉克
剧情：Tommy Greer is a crime buff who decides to commit a motiveless murder in order to confuse the police. He selects his victim from a phone book at random. He tracks him down and kills him but his "perfect crime" is unraveled by modern crime-fighting techniques.