George: "That's right. Later, everyone ran to the boiler room, but we never found any such mechanism."
Kanon: "Precisely. Lin Yan, what kind of mechanism do you think killed me?"
Lin Yan: "Th-That, I don't know. But anyway, it must have been an extremely clever mechanism. Or else, someone could be lying, right? And maybe Kanon, you were staging everything yourself from beginning to end? N-No, that's it. You staged it yourself. Aunt Eva and her husband staged it too. They made a locked room and then pretended to die."
Jessica: "Lin Yan, you're getting more and more ridiculous. Is something wrong with your head?"
Lin Yan: "W-What I said wasn't strange enough for you to look at me with pity, was it? I'm just discussing the possibilities of a locked-room trick, okay? Besides, the dead not actually being dead is also a common device in detective novels."
George: "A common device."
Lin Yan: "I-I mean, when Kanon was killed, everyone's whereabouts were indeed clear. So assuming Old Woman Kumazawa wasn't lying either, that only applies to the survivors. If the culprit faked their death and blended in with the victims, they could move about in secret. Then everything makes sense."
Jessica: "Sigh, so you mean the culprit was Aunt Eva and her husband. But their deaths were confirmed by Dr. Nanjō, weren't they?"
Kanon: "Yes. Dr. Nanjō examined every corpse. If we accept Lin Yan's explanation, then Dr. Nanjō was an accomplice as well?"
Lin Yan: "R-Right, exactly. If Dr. Nanjō could also have been an accomplice who issued false death certificates, then the situation changes completely. Isn't that another common device in detective novels?"
Maria: "But Dr. Nanjō was killed too."
Lin Yan: "Th-That... right, Dr. Nanjō faked his death. After all, aside from Dr. Nanjō, nobody knew