In 1900 San Francisco, a white woman is murdered in Chinatown, and the suspect is a Chinese man. The murder causes a social uproar, and the public demands that Chinatown be outlawed. Chinese medicine practitioner QIN FU (LIU Haoran) and Chinese man Ah Gui (WANG Baoqiang) are drawn into the case and race against time to find the killer in a battle of wits and courage.