The narrator tells us that he's seen a lot of sleepwalkers in his life, including a burglar who wakes up with no idea who he is. The kidnapper wants a hundred thousand taels in ransom, but the narrator loves his money so much that he leaves the fate of his twin sister to the kidnappers. Thirteen days later, the son is found lying unconscious on the street of Jin-ling. The strange thing is that the son woke up without remembering the abduction. The narrator says that he heard on his way to the city that his sister had been abandoned by her family, and that the boy's sleepwalking became his nightmare. He's got some medicine to treat his sleepwalking, but he can't stop thinking about his sister.