The narrator of the story tries to prove that he is not insane by recounting the carefully planned murder he has committed.
The narrator is scared and infuriated by the blind eye of an old man he lives with. He perceives the eye as evil due to its blue colour, so he plans to murder the man. For seven days, the narrator treats the old man very nicely during the day and spies on him during the night. He enters the man's room every night, shining down a ray of light on the blue eye; however, the old man's eye is always closed.
On the eighth night, the old man wakes up when the narrator makes noise while entering his room. The narrator is aware that the old man is frightened and decides to wait. After an hour, he shines a ray of light towards the man's eye and sees it open. The narrator starts hearing the old man’s heartbeat and senses him growing agitated. He decides to attack the old man because he fears the neighbours will hear his loud heartbea...