He is unable to prevent the thieves from killing the caretaker and making off with another exhibit, but he does find a clue: a matchbook from the Club Do-San in Shanghai, which is owned by a friend of his. In Shanghai, policeman Sung-Chi Li spots a beautiful young woman with a small child leaving an opium den he has just raided but loses them outside.
He cannot prevent the thieves from killing the caretaker and stealing another exhibit, yet he finds a clue: a matchbook from the Club Do-San in Shanghai, which is owned by one of his friends. In Shanghai, police officer Sung-Chi Li notices a beautiful young woman with a child leaving an opium den that he recently raided but can't follow them outside.