The narrator finds the inside of the house just as spooky as the outside. He makes his way through the long passages to the room where Roderick is waiting. He notes that Roderick is paler and less energetic than he once was. Roderick tells the narrator that he suffers from nerves and fear and that his senses are heightened. The narrator also notes that Roderick seems afraid of his own house. Roderick’s sister, Madeline, has taken ill with a mysterious sickness—perhaps catalepsy, the loss of control of one’s limbs—that the doctors cannot reverse. The narrator spends several days trying to cheer up Roderick. He listens to Roderick play the guitar and make up words for his songs, and he reads him stories, but he cannot lift Roderick’s spirits. Soon, Roderick posits his theory that the house itself is unhealthy, just as the narrator supposes at the beginning of the story.
Madeline soon dies, and Roderick decides to bury her temporarily in the tombs below the house. He wants to keep her in the house because he fears that the doctors might dig up her body for scientific examination, since her disease was so strange to them. The narrator helps Roderick put the body in the tomb, and he notes that Madeline has rosy cheeks, as some do after death. The narrator also realizes suddenly that Roderick and Madeline were twins. Over the next few days, Roderick becomes even more uneasy.