Detective Chinatown 1900 (1970)

In 1900's San Francisco, a white woman is murdered in Chinatown and the suspect is a Chinese man. The murder causes a social shock and the public calls for Chinatown to be outlawed. Chinese medicine practitioner Qin Fu and Chinese man Ah Gui are involved in the case, and they race against time to find the murderer amidst a battle of wits and courage.