年轻正义的探长索米尔无疑是编导心目中的英雄。他忠于职守,抓住线索,穷追不舍,伸张正义与维护法制,即使这案子涉及了石油大王马丁内堤,哪怕危及自己的前途命运,他也在所不惜。而对于下层无辜的受害者,如妓女托尼希娜则充满了谅解与同情。他的正义感与大无畏的勇气赢得了他的女友、女记者马丽娅的尊敬与帮助,使他断线结网,取得了重要的罪证材料。然而,罪犯的黑手已经伸向了司法机关内部,以至于最后探长索米尔自己也在罪犯的暗枪下饮弹殉职。Starting the investigation of a murder mystery, a police man is to investigate dangerously top politicians and military. A chain of suicides takes its toll among the current and past leaders of Italy in a particularly difficult season for the Italian Democracy.