In 1935, Ma Jiaqi, the first Chinese criminal inspector in the French Concession, forms a special investigation team after solving a Green Gang revenge sniper case. With him are toxicology expert Ding Chengxin, forensic pathologist Song Yaxuan, combat specialist Liu Yaowen, mechanisms expert Zhang Zhenyuan, intelligence specialist Yan Haoxiang, and socialite He Junlin. Together, they protect Shanghai in an age of turmoil.
