美国洛杉机,在通向圣塔莫尼克方向的高速公路上,身材魁梧,目光炯炯有神的警探阿兰·萨顿驾驶着他的汽车紧跟着百米以外的一辆雪弗兰轿车,轿车上坐着一位少妇,她是萨顿的朋友威廉·艾德森的妻子艾丽,因为艾德森怀疑他的妻子有外遇,并有大量不明去向的花销,便委托萨顿暗中调查,此时萨顿正紧握方向盘紧盯着前面的那辆在车流中穿来穿去的雪弗兰轿车,那辆轿车忽然在人行道边停下,一个窈窕的金发女郎跳上车去,接着车便急驶而去。过了一会儿,金发女郎下车,匆匆朝马路对面的出租汽车站走去,登上一辆出租车,此时艾丽的车也开走了。这诡秘的举动令萨顿疑惑,而此时在萨顿的后面也有一辆黑色的轿车紧紧跟踪着他们,萨顿紧跟着那辆出租车驶入一条狭窄破烂的贫民街,出租车在一幢窗户又小又脏的楼前停下,那姑娘匆匆下了车飞快地跑进楼,姑娘的高跟鞋在水泥台阶上响着,在四楼消失了,萨顿来到四楼,发现有四道门全是一样的,于是他随便地敲了一家的门,一个酒鬼从门后伸出头来,用敌意的目光盯着他问:“你想干嘛,我什么也不买!” Los Angeles, USA, on the highway leading to Santa Monica, burly, bright eyes of detective Alan Sutton driving his car followed by a Chevrolet sedan 100 meters away, sedan Sitting on a young woman, Elle, the wife of Sutton’s friend William Adderson, who commissioned Sutton’s interrogation because Adder suspects his wife had an affair and has a large number of unscrupulous expenses, At this point Sutton is holding the steering wheel firmly in front of the car in the traffic wear Chevrolet sedan, the car suddenly stopped at the sidewalk, a shy blonde jump on the car, then the car will be anxious Go away. After a while, the blonde got off and hurried toward the taxi stand across the road, boarding a taxi, and Elle’s car drove away. Sutton was puzzled by this secretive move, and a black car followed closely behind Sutton at a time when Sutton followed the taxi into a narrow, abject street of slums A small, dirty window in front of the building stopped, and the girl hurriedly ran into the building quickly. The girl’s high heels sounded on the concrete steps and disappeared on the fourth floor. Sutton came to the fourth floor and found The four doors were all the same, so he casually tapped at one of the doors, an alcoholic reaching out from behind the door and staring at him hostilely: “What do you want, I do not buy anything!”