Ichirō Hatamoto has been wounded in the bathroom which he doesn't know who which person attacked him. They've then see Jōji Hatamoto's knife which the mother of Ichirō thinks that Jōji has done it. Jōji then explains why he can't be it, also he has been in the dining room with them. They're then focusing their minds to Takeshi Hatamoto claiming that he is the one who had done it. Kogorō then tells that everyone must go with him to the engine room except Ran and Natsue Hatamoto. Once in the engine room, Kogorō showed him the trick how the culprit can cause a blackout on the ship. Conan and the others are still running around the ship to look for Takeshi, once being in Jōji's room, they've opened his briefcase and sees that two knife's has gone missing. They're then in Ichirō's room where they've seen his paintings. Conan asked a few questions to Ran which they are yelled by Kogorō to look further. They're then in Akie Hatamoto's room which Conan opens the closet and starting to be in shock and then closes it again. Kogorō asked Conan if he found something but he said that he didn't. Conan ask something to the butler and recalled the recent attacks on the ship. Conan then knocks Kogorō out with one of his gadgets and then later asks Ran to tell that everyone on the ship must come. As in the room, Conan with the voice of Kogorō then says that he has discovered the real culprit.