Anticipating eviction from her retirement home after the death of her son and sole provider, rebellious septuagenarian Émilie decides to take revenge on all those who have wronged her. During her journey of initiation, she cuts to the quick to right the wrongs and is joined by Linda, a cleaning lady with whom she has forged a close bond. She, too, has nothing left to lose and decides to wage war against those who have scorned her. Soon, these two companions are hunted down by a pair of policemen.

LOUISE-MICHEL是巴黎公社著名女领导人的名字，但本片不是这位“蒙马特尔高地红色处女”的传记片，而是讲述两个无产阶级的故事。露易丝是一个不识字的女工，谁要是在她面前说她文盲，她就不会对这个人客气。她和同事发现老板在一夜之间把工厂里所有的机器都搬走了，只留给他们几百欧元的赔偿。在气愤之余，她提议雇请一名杀手杀掉流氓老板。她找来的杀手就是米歇尔，他是一个极其平庸的保安员，住在废弃的露营车里。这两个既愚蠢又恶毒的人是否能够消灭流氓资本家？

彭兹尼家族经营一家位于商业区的名为“土豆坊”的餐厅。家族长子诺特是资深朋克一族，他的弟弟让·皮埃尔在一家床上用品商店当售货员。一天，让·皮埃尔被解雇了，两兄弟在街上重逢。《难忘之夜》讲述的就是一个家庭决定以其特有的方式进行变革的故事。