刘五四在外出当兵三年后，复员回到家乡，面对迷茫的前途，他始终坚持要做一个有用的人。刘五四不甘只做一名窑工，通过考试当上了镇上派出所的户籍警。虽然只是一名合同制的草帽警察，每天周旋于邻里乡间进行调解工作、处理鸡毛蒜皮的小案件，但刘五四始终坚持着自己公平公正的为人处世原则，有些“一根筋”甚至是拧巴。但这...样的拧巴一方面给他带来了爱情和友情，另一方面也招致了很多乡亲的不理解、不满，给自家惹了很多麻烦。刘五四在警察这个职业中不断锤炼打磨，他始终抱着“要做一个有用的人”的梦想。在经历了一系列的风风雨雨之后、也在派出所钟所长的悉心指导下，逐渐成长为了一名优秀成熟的人民警察。
不料高秀兰一大清早便出了门，坐上了开往老家的中巴车，而跟踪高秀兰多日的梁庆远此刻早已潜上了中巴车。突然，从梁庆远的口袋里掉出了一把枪。梁庆远挟持了整整一车人，接到报警的刘五四火速前往与梁庆远谈判。刘五四一边与梁庆远周旋，一边派人找来了梁庆远的父亲老梁头。然而众人劝说无果，梁庆远执意要为母亲复仇。梁庆…
枪响惊动了众人，刘五四等人及时赶到，还好于艳华只是受到了惊吓，并未受伤。梁家偷盗树苗的嫌疑被排除了，但老梁太太咽不下这口气，找高秀兰理论。争吵中老梁太太心脏病突发，在抬往医院途中身亡，梁家大闹派出所，要高秀兰一命换一命。正当刘五四焦头烂额时，早已调走的老万回来了。老万前去吊唁老梁太太，面对悲愤的梁家…
梁家想跟邻居高秀兰买树苗，价格没有谈拢，两家吵起来。第二天高秀兰家的树苗被盗，高秀兰怀疑是梁家所为，向派出所报了案。梁庆远撞见膀子，告诉他这次出来就是要找刘五四报仇。刘五四等人按照正常程序来梁家进行调查，却被赶了出来。红石村发生小学生集体中毒事件，于艳华前往红石村进行处理，赵炳万、刘仁贵等人安排人手…
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