What is the significance of the close resemblance of Roderick Usher and his sister? Are the two the product of, and guilty of, incest? Did Roderick Usher intentionally try to murder Madeline, and did Madeline actually return from her tomb vampire-like, to claim her brother's life? Is the physical house actually "alive" and by some preternatural force of will controlling the destinies of the Ushers? Or is the story not a tale of the supernatural at all, but rather, a work of psychological realism? What then is the precise role of the narrator? And can the work