写实警匪片,以年轻女警到巴黎红灯区调查卖淫业为线索,展现巴黎地下社会的风情画。A killer has found a way to kill women without committing the crime. He gets them to fall in love with him, like Isolde falls for Tristan in the epic poem, and then he leaves them. Heartbroken they choose suicide, just like Isolde.