Uninvited Inspector Tung is on a difficult mission to follow the murderer Shing, but he does not manage to find and arrest him in any form. As his investigation continues, Tung discovers the link between Shing and the Blackie mobster hiding on a cruise ship. Shing finds himself forced to kill his foster father. He’s also losing his share of winning because he chooses to betray him on Blackie. To take revenge, Shing makes his appearance on the cruise ship, but he does not know that Tung is here to hunt him.