The theme of "The Tell-Tale Hearts", a gothic fiction story by Edgar Allan Poe is that you don't commit a crime or you will go to jail because the guilt from the crim will drive you insane and make you confess. In paragraph 17-18 it shows how insane he was getting because he could hear the old mans heartbeat which would be impossible since he killed him, and chopped him up. And in paragraph 18 it shows him confessing.
I'm not crazy
The narrator explains and describes, from a jail cell, that he is not mad and he defends himself by explaining the story. He says how he loved the old man and all that
He says the reason he was very, very uncomfortable by the old man was his pasty blue almost vulture eye with a film over it and it haunted him day and night
He began to go insane, so he decided he would kill the old man. Every knight he would go into his room and watch him with a thin little flashlight, but he would never do it because his eye was closed.
He Kills the old man by throwing him onto the floor and puts the bed over him and suffocating him to death
He begins to cut up the body. After he cut up the body he takes up the floor boards and throws the dead old man into the floor, then he re-seals the floor.
Someone had called the cops on the narrator. The cops searched the place but found nothing. The narrator got too cocky and decided to let them stay for a drink, but the narrator got increasingly insane and started to hear the old mans heartbeat, but that would be impossible because now he is dead. So he decided to show the cops the dead body.