All the Wrong Clues (1981)

Chief inspector Robbin gets informed that Capone is going to kill a private eye Yoho for revenge. In the same time, Yoho mets a rich old man from Shanghai, who owns lots of stocks, and knows that Capone is trying to kill the old man and his young pretty daughter in order to get the stocks. So, Yoho starts to protect the old man and his daughter. But, more things happen and Yoho discovers that the old man's daughter is not really the real daughter and more other mysteries...