The man explains his plan on what he will do to the old man because the old man's eye looks strange and scares him.
The man wants to be rid of the old man's eye and so enters his bedroom to take action against it.
The old man is frightened when he hears someone in his room. He is unaware that it is the man contemplating how he will go about killing him because of his strange eye.
The man kills the old man by putting the bed on top of him. He decides to hide the dead body in pieces under the floor boards.
The man acts like nothing happened when he is questioned by the police about a call received from a neighbor who heard a scream. He tells them it was probably himself they heard screaming in his dreams.
The man confesses that he killed the old man because he heard the old man's heart beating loudly through the floor boards, and was ringing in his ears. His sense of guilt overcame him and he broke down.