The character gets an invitation to come to the usher house, he is skeptical, but goes anyway from noticing that he is Ushers only friend. when he gets there he notices how poorly the house has been taken care of.
When he gets inside he sees how poor the interior is and how old fashioned and run down it really is. he meets usher and realizes how poorly his old friend has treated him self he notices how luminous his eyes are and realizes he friend isn't all there anymore.`
He walks through the halls with usher to the dining area, as he is walking he notices the things you'd expect to see in a home like this but something is making him feel uneasy.
They buried ushers sister in the vault and are now grieving for her passing but wait whats this usher keeps saying he hears her moans and cries and seems to be going crazy then the sister of usher appears in the door way and stumbles toward usher.
When Madelyn makes final steps toward her brother and finally collapses that does it for her brother they both fall and that was the end of the brothers and sisters lives.
The end results in the nararator leaving the house crumbling down and that was the final end of the usher house.