一名针对小女孩作案的连环杀手（Peter Lorre 饰）出没，城中人心惶惶。警察全体出动，频繁突击检查。黑帮首领（Gustaf Gründgens 饰）因生意受到严重影响，决定利用乞丐的隐蔽性布下天罗地网。卖气球的盲丐（Georg John 饰）通过《在妖王宫中》的口哨声辨出了杀手，他的同伙（Carl Balhaus 饰）趁机将“Mörder”的首字母“M”标记在其背上。虽然警方锁定了杀手的住处，但杀手被乞丐围困于商业大厦，成了瓮中之鳖。深夜，在黑帮私设的法庭上，杀手会为自己作出怎样的辩护？

Of all the Fritz Lang films I have seen, this may be the one that I was least enamored with. Gary Cooper seems miscast as an atomic scientist (Prof. Alvah Jesper), who is sent to Europe by the OSS to rescue other scientists who are being forced to cooperate with the Nazi atom bomb project. During his mission, he becomes involved with the Italian resistance, falling for plucky Gina (Lilli Palmer). I've read that Lang originally shot this film emphasizing the dangers of atomic power, but Warner re-edited and it fails to have any direction. It still shows a few Lang-esque moments, but this is only recommended for his most devout following as it really lacks any punch... or his signature panache.

保罗（米歇尔·皮寇利 Michel Piccoli 饰）与卡米尔（碧姬·芭铎 Brigitte Bardot 饰）是一对幸福的夫妻，保罗剧作家的工作也足以保证他们的衣食无忧。一次，制片人普罗可修（杰克·帕兰斯 Jack Palance 饰）邀请这对夫妻参加一个会谈，在会谈之中，面对着滔滔不绝的丈夫，卡米尔的心中第一次浮现出了一种名为“轻蔑”的可怕情感。
　　随着时间的推移，这种情感非但没有减弱，反而越来越强烈，强烈到她已经无法再像以前那样的对丈夫施以深刻的爱意。同时，英俊帅气的普罗可修吸引了卡米尔的注意，两人越走越近。当奸情败露后，保罗大发雷霆，可卡米尔和普罗可修却毫不在意的驾驶着豪车扬长而去，哪知道，悲剧性的命运正在前方等待着他们。