The Tell Tale Heart by Edgar Allan Poe

The story is about a mad person who, after killing a companion for no apparent reason, hears an interminable heartbeat and releases his overwhelming sense of guilt by shouting his confession to the police.The narrator of ‘‘The Tell-Tale Heart’’ recounts his murder of an old man. Since he tells the story in first-person, the reader cannot determine how much of what he says is true; thus, he is an unreliable narrator.
He tells the tale of how an old man who lives in his house has never wronged him. For an unknown reason, the old man’s cloudy, pale blue eye has incited madness in the narrator. Whenever the old man looks at him, his blood turns cold. Thus, he is determined to kill him to get rid of this curse.