The narrator arrives at the house of usher to his old friend in a time of illness. does he succeed in his purpose?

in my opinion, based on what little I have, yes.

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

Explanation:

As the narrator reads the text aloud, all the sounds from the fictional story can be heard resounding from below the mansion. It doesn't take long for Usher to freak out; he jumps up and declares that they buried Madeline alive and that now she is coming back. Sure enough, the doors blow open and there stands a trembling, bloody Madeline. She throws herself at Usher, who falls to the floor and, after "violent" agony, dies along with his sister. The narrator flees; outside he watches the House of Usher crack in two and sink into the dark, dank pool that lies before it

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