影片围绕埃特勒塔的一个警察队长洛朗展开。他计划迎娶长期伴侣、同时也是自己女儿母亲的“小母鸡”玛丽结婚。他热爱自己的工作，尽管不可避免地每天都会遭受社会的刁难。而当他试图拯救一个用自杀作为威胁的农民时，却不小心杀死了这个农民，他的生活也就此彻底陷入混乱。

　　A Parisian museum director believes his wife has lost interest in him and so places a poisoned cigarette in the box on his desk - thus allowing chance to decide the moment of his death.