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 fails to 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 spots a beautiful young woman with a child leaving an opium den that he recently raided but can't follow them outside.