Violence and death stalk the Chinese faction of a large American city, but one man, Dr. Chang Ling, and his daughter, Dr. Mary Ling, defy the racketeers who are responsible and, against terrific odds, bring peace to their oppressed neighbors. Gangland overlord Frank Baturin is shot and only the intervention and operation by Mary Ling saves his life. She performs the operation because it is her duty as a doctor, but she also thinks Baturin was shot by her father following a quarrel with Baturin. The racketeer then sets out for vengeance against the man who had actually tried to kill him in order to take over the Chinatown rackets.