伦敦频频遭到无政府主义者的破坏，元凶是巴沙电影院的老板维洛克，电影院对面的水果店里有位新苏格兰场派来专门监视维洛克的侦探特德……

A drunken newspaperman is rescued from his alcoholic haze by an heiress whose love sobers him up and encourages him to write a play, but he lapses back into dipsomania.

On a hot summer afternoon in New York, Emma Jones gossips with other neighbors in her residential building about the affair that Mrs. Anna Maurrant and the milkman Steve Sankey are having. When the rude and unfriendly Mr. Frank Maurrant arrives, they change the subject. Meanwhile, their teenage daughter Rose Maurrant is being sexually pressured by her married boss Mr. Bert East...

乔安（西尔维娅·西德尼 Sylvia Sidney 饰）在公共治安防卫队工作，这也就意味着，她平日里打交道的，都是一些非常危险的犯罪分子。好巧不巧的是，乔安竟然爱上了其中的一个，那是一个名叫艾迪（亨利·方达 Henry Fonda 饰）的男人。 　　高大英俊的艾迪给予了乔安一种错觉，那就是他本质上其实是一个好人，只不过一时走火入魔才走上了犯罪的道路。乔安坚信通过自己的努力，能够使艾迪改邪归正重返社会。在乔安的帮助之下，艾迪通过良好的表现获得了减刑，并且最终刑满出狱，之后乔安和艾迪携手步入了婚姻的殿堂。然而，一个人的本性真的能够如此轻易的被改变吗？