True!--nervous --very, very dreadfully nervous I had been and am; but why will you say that I am mad?
I think it was his eye! Yes, it was this! He had the eye of a vulture - a pale blue eye, with a film over it.
I found the eye always closed and so it was impossible to do the work.
The narrator is introduced. By denying that he is crazy, it makes him seem psychotic. He wishes to prove his sanity to the reader despite having killed an old man over deformed eye.
The night waned, and I worked hastily, but in silence.
The narrator explains that the old man has a “vulture eye” that is light blue with a film over it. He is deeply bothered by the old man’s eye and plans on killing him.
I went down to open it with a light heart, --for what had I now to fear?
Over the next seven nights, the narrator plots killing the old man to get rid of the "evil" eye. Each night, he enters the old man's room with a lantern but he could not see the eye.
Villains! dissemble no more! I admit the deed! --tear up the planks! here, here! --It is the beating of his hideous heart!
Finally, on the eighth night, the narrator sees the eye. He pulls the old man off the bed and smothers him with his mattress until he can no longer hear the old man's heartbeat.
Summoned by the old man's neighbour who claims he heard a shriek, the policemen arrive at the house. The narrator tries to cover up by saying it was him that screamed, and that the old man was out of town.
The narrator believes he hears a ticking noise that grows louder and louder. He believes that it is the sound of the old man's heartbeat and confesses to the policemen.