Roderick Usher wrote a letter to the narrator to come visit him for a short amount of time.
Climax & Foreshadowing
Roderick Usher is sick and the narrator is reading to him because he wants him to fell better.
After Madeline was put in the vault, the narrator begins to hear strange noises in the house. In the middle of the storm, Usher comes to the narrators bed chamber and they open the window to a terrifying storm with low-hanging clouds and fog he read to calm Usher down. Foreshadowing: Lady Madeline has blushing on her face so it means she's probably alive.
As the narrator reads, the sounds he describes begin to echo in the house. When he reaches the climax of the story, they hear a scream. Usher tips over his chair and begins rocking back and forth. Usher whispers that he's been hearing sounds from his sister' coffin and he fears he buried her alive. The door flies open, and there is Madeline, covered in blood. Foreshadowing: The narrator heard the exact same shriek as in the story.
Madeline leaps on Roderick and dies. Roderick also dies, likely from shock and fear. The narrator flees the house.
As the narrator watches, he sees the house collapse and disappear into the ethered fog and waters. Eventually, the house is completely gone.