一名警官自杀了，侦探戴夫（格伦·福特 Glenn Ford 饰）奉命调查这起蹊跷的案件。本来一切都按照程序正常的行进着，在快要结案之际，一个女人忽然现身，她声称她有证据证明这位警察并非自杀，而是死于谋杀。与此同时，戴夫亦收到了上级的命令，命他停止调查此案，这让本就起了疑心的戴夫感到更加的不对劲。 　　随着调查的深入，黑帮老大勒加纳（Alexander Scourby 饰）的身影浮出水面，让戴夫没有想到的是，他的挖掘真相的举动，竟然为自己引来了杀身之祸，虽然他幸运的逃过了一劫没有让杀手得逞，却牵连了一名无辜者。戴夫的正义之魂被点燃了，他发誓要和恶势力斗智斗勇到最后。Dave Bannion is an upright cop on the trail of a vicious gang he suspects holds power over the police force. Bannion is tipped off after a colleague's suicide and his fellow officers' suspicious silence lead him to believe that they are on the gangsters' payroll. When a bomb meant for him kills his wife instead, Bannion becomes a furious force of vengeance and justice, aided along the way by the gangster's spurned girlfriend Debbie. As Bannion and Debbie fall further and further into the Gangland's insidious and brutal trap, they must use any means necessary (including murder) to get to the truth.