In 1900, a white woman is murdered in San Francisco’s Chinatown, and the suspect is a Chinese man. The murder causes social shock, and the public calls for Chinatown to be outlawed. Chinese medical practitioner QIN FU (LIU Haoran) and Chinese Ah Gui (WANG Baoqiang) are involved in the case and race against time to find the killer in a battle of wits and courage.