The Detective boys figure out the caverns are names for Shogi pieces from Conan's hints, the layout, and trial and error. They use their detective badges to attract bats and distract the man watching for them. They flee down the correct path, but the suspects catch up and threaten to kill them. Luckily Haibara and Agasa informed Megure who has the cave surrounded. Two of the culprits give up, while the other one takes Conan hostage at gun point. Conan tranquilizes him.