Usher's madness begins to increase because he can hear the sound of Madeline below.
Even though his sister is buried in the basement, he can constantly hear her scratching her coffin. He was tortured by these sounds until the protagonist came to visit him so he could share his troubles with him. Usher is afraid of his 'undead' sister and of dying himself, which is why he grows crazier and crazier by the day, until he is finally killed by his own sister in the end.
Answer:
Explanation:, the theme is the underlying message that a writer wants to get across, such as ... It can be whatever the author deems appropriate, and there can also be more than one theme. ... or turning away from - the theme time and again, and you'll see how their relationship