The narrator is introduced and wishes to prove that he is not mad depsite killing a man over his deformed eye.
The narrator lives in the same building as an old man with a eye that looks like the one of a vulture's with a film covering it. The eye makes him feel so cold that he plans to kill the old man, so he can never see the eye again.
Over the next several nights, the narrator plans on killing the old man to get rid of his eye. Every night he goes into the old man's room without making a sound, and watches him until he sees the eye.
I admit the deed! Tear up the planks! Here, here! It is the beating of his hideous heart!
Finally, one night, the old man woke up and screamed to a noise made by the narrator. He then pulled the old man off the bed and suffocated him with his mattress until he could no longer hear the old man's beating heart
The police were called by a neighbor about hearing a scream. When the police showed up, the narrator tried to cover it up by saying he was the one who screamed and the the old man wasn't home.
The narrator confessed about murding the old man after believing that he was hearing the ringing of the old man's heart grow louder and louder.