The narrator arrives at the house of usher to his old friend in a time of illness. does he succeed in his purpose? no, he succumbs to the same illness as usher. yes, he cheers his friend up as best as he is able. no, he is not able to stop the madness that destroys usher. yes, he his friend take care of his dying sister.

No, he is not able to stop the madness that destroys Usher.

Madeline comes out from where they've buried her alive covered with the blood of her struggles and attacks Roderick. The effort drains whatever life she had left and she dies. Roderick dies from the shock of it all. The narrator flees the house just as it begins to crumble like it's inhabitants - because really they're one in the same.

"it's more of an essay than story, but perhaps it is best described as a mood-piece: it uses a lot of musical imagery, not to mention sea imagery, religious imagery, and any other imagery that suits his purpose."