Nounours is the nickname of a "cousin" an informer with a special arrangement with the police: he gets 10% of the drugs seized thanks to his help. When his personal contact, inspector Maurin, commits suicide, inspector Gérard Delvaux takes over. Meanwhile, judge Lambert is uncovering the illegal practices of the policemen. Her persistent investigations, which had cornered Maurin, are leading to Gérard, and also to Nounours as the source of heroin that led to recent cases of deadly overdoses. Nounours promises Gérard increasingly bigger catches which he is intent on realising before he is forced to reveal who Nounours is to judge Lambert.

关于巴黎吸毒分子的真实写照，以鲜明的现代色彩和反叛精神来刻画吸毒青年虚无的生活态度，社会写实作品。 本片是法国著名导演贝特朗.塔韦尼埃执导的经典作品之一，内容讲述巴黎吸毒份子的真实生活写照，以鲜明的现代色彩和反叛精神来刻画吸毒青年们虚无的生活态度，是一部上乘的社会写实影片。