使命是一部剧情片，鉴于清水市越来越乱的社会治安，林荫（张嘉译 饰）临危受命，担任了清水市新一届公安局长。赴任途中，他亲手抓获了三个行凶的壮汉，但其中一人却让派出所长赵铁军（李梦男 饰）放跑，加之副局长牛明（赵小锐 饰）不冷不热的态度，让林荫很不是滋味。某夜，市委万书记（徐敏 饰）办公室被盗，林荫立下限期破案的军令状。从此，林荫依靠秦志剑（刘均 饰）、高翔（于俭 饰）等刚正不阿的干警，在市委陈副书记、洪市长支持下，与郑光军（谢钢 饰）和公安内部的腐败势力展开了殊死斗争。神通广大的郑光军游说上层领导，暗示要在清水开赌场，林荫将计就计，制定了行动方案“雷雨行动”，他决定彻查黑势力之后的保护伞……
The recent disorders and rampant criminal activities break the serenity of Qingshui city, posing a major threat to Qingshui people's safety. Yet Qin Zhijian and a number of upright policemen are at the end of their resources to put down the criminal activities. At this crucial point, Lin Yin is appointed as chief of Public Security Bureau. Yet what he doesn't know is that the whole Qingshui town has fallen under the control of a syndicate organization led by Zheng Guangjun, who has established a powerful network from top to bottom, including secretary of municipal party committee, mayor, secretary of Politics and Law Committee, the deputy chief of Public Security, head of criminal affairs detachment, and ordinary policemen. A syndicate organization, which consists of underground government, organization department, court and police station, has begun to emerge. Meanwhile, a large number of narcotic drugs are shipped out of Qingshui Town. Sky falls; murders are rampant; social orders are falling apart. Lin Ying's only choice is to do everything to crack down the criminal network. However, Lin Yin himself is also faced with the coercion of the underground organization. In this battle, who will prevail? And the price of losing is life and honor. Even a slight move in one part will encounter the resistance of all the evil forces in Qingshui.
一句话评论：古早电视剧，今天还顶用。隔窗看法治环境之变。有一种想当警察的感觉。一点感想。要镇住邪，首先自己要强大。喜欢林荫，因为我们都期待光明。第一次看张嘉译的剧。官商勾结，清水不清！。晚来风寒 不知你够不够暖。老片新看。
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