The narrator tells us that he fled from the chamber and from the entire mansion and, at some distance, he turned to look back in the light of the "full, setting and blood-red moon" (emphasis mine) and saw the entire House of Usher split at the point where there was a zigzag fissure and watched as the entire house sank into the "deep and dank tarn" which covered, finally, the "fragments of the 'House of Usher.'" There are more varying interpretations of this story than there are of almost any of Poe's other works. For some of the widely differing interpretations, the reader should consult the volume Twentieth-Century Interpretations of Poe's "Fall of the House of Usher." One key to the story is, of course, the name of the main character. An usher is someone who lets one in or leads one in. Thus, the narrator is ushered into the house by a bizarre-looking servant, and he is then ushered into Roderick Usher's private apartment and into his private thoughts. Finally, usher also means doorkeeper, and as they had previously ushered Lady Madeline prematurely into her tomb, at the end of the story Lady Madeline stands outside the door waiting to be ushered in; failing that, she ushers herself in and falls upon her brother.
In the concept of twins, there is also a reversal of roles. It is Usher himself who seems to represent the weak, the over-sensitive, the over-delicate, and the feminine. In contrast, Lady Madeline, as many critics have pointed out, possesses a superhuman will to live. She is the masculine force which survives being buried alive and is able, by using almost supernatural strength, to force her way out and escape from her entombment in the vaults, and then despite being drained of strength, as evidenced by the blood on her shroud, she is able to find her brother and fall upon him.
Another reading of the story involves the possibility that Roderick Usher's weakness, his inability to function in light, and his necessity to live constantly in the world of semi-darkness and muted sounds and colors is that the Lady Madeline is a vampire who has been sucking blood from him for years. This would account for his paleness and would fit this story in a category with the stories of Count Dracula that were so popular in Europe at the time. In this interpretation, Roderick Usher buries his sister so as to protect himself. Vampires had to be dealt with harshly; thus, this accounts for the difficulty Lady Madeline encounters in escaping from her entombment. In this view, the final embrace must be seen in terms of the Lady Madeline, a vampire, falling upon her brother's throat and sucking the last drop of blood from him.
