Takato comes to Hong Kong to help a human being called "The King of the Cave" out of an abandoned building. Kindaichi, Miyuki and Saki goes to HK for the second time for a show featuring "Maskman". They meet Officer Lee (who has appeared in Episode 1-4) in the King Dragon Hotel. In a hotel suite, three Japanese dealers are conversing. Suddenly they have got a box with another group member's hand in it and they realize that this member was killed.