Blanc de Chine (1988)

Mathieu is called on by the French government to investigate murders in the Asian community of Paris. With Chinese and Vietnamese engaged in a bloody slaughterfest, the key to the mystery lies with the orphan girl who Mathieu helped to escape during the fall of Saigon in 1975. Now a beautiful young woman, Mathieu is reunited ten years later with the refugee, and together they attempt to solve the case. He uncovers a CIA plot that has carried over from the last days of the Vietnam War and that is related to the Paris murders.