U.S. Marshal Raylan Givens is a modern day 19th century-style lawman, enforcing his brand of justice in a way that puts a target on his back with criminals and places him at odds with his bosses in the Marshal service. That conflict results in a reassignment for Givens to the U.S. District covering the town where he grew up. He is an anachronism - a tough, soft spoken gentleman who finds his quarry fascinating, but never gives an inch. Dig under his placid skin and you'll find an angry man who grew up hard in rural Kentucky, with an outlaw father, who knows a lot more about who he doesn't want to be than who he really is.

　　2008年，某市公安局缉毒支队大队长姚远、副大队长金锐在执行一次缉捕任务时，姚远牺牲。省公安厅派金锐到市警官学院执教。姚远新婚妻子宋而瑞是金锐的昔日恋人。
　　金锐带班的五名学生各有所长，他们在与金锐的朝夕相处中，逐渐成长为具有责任感、对犯罪有着灵敏嗅觉的预备警官。共同执教的相处，相同的育德育人理念令而瑞越发理解了金锐。组织安排金锐进入警院教书是为一起跨国涉毒专案做长远部署；金锐、而瑞带领的一群预备警官将专案顺利侦破，新一代的任务拉开序幕。

　　“八一三”以后，日军全面攻陷上海，租界区成了战争以外的孤岛。一个以锄奸为已任的秘密组织猎鹰暗杀队应运而生，他们以燕双鹰（张子健 饰）为首出没于日伪之间，极力阻止日寇对我财富的掠夺。日军从东京派来特使今井武夫（平田康之 饰），企图利用假钞套购中国的黄金。燕双鹰打通市长（梁冠华 饰）关节，利用其女儿章月欣（苑冉 饰）之口，与郑雅姝（王紫瑄 饰）、林小江（刘亚津 饰）设下圈套，并冒充日本亲王将今井武夫费了九牛二虎之力搞到的黄金秘密劫持，同时将责任嫁祸于外滩的黑帮组织。今井武夫恼羞成怒，派章月欣打入暗杀组织内部，以图里应外合将其一网打尽。不料章月欣暗恋着风流倜傥的冷面杀手燕双鹰，这是今井武夫做梦也没想到的......