Answer:
If it's about the Tell-Tale Heart then this would be my answer,
The Tell-Tale Heart is one of the shortest stories Edgar Allan Poe penned down, yet it remains a classic.
As in most of his work, Poe employs the first person point of view, in which the narrator tells the story using the first person pronoun “I” and thus closes the gap between the reader and the characters.
First person narration is subjective, we as an audience are brought into the biased point of view of the narrator, and this is why it is also known as an ”unreliable narrator” – as opposed to the “omniscient narrator” who knows and sees everything and uses the third person point of view.
In this story, the narrator is unreliable by nature, a mad narrator that cannot tell the story objectively because he justifies his actions throughout the text.
The very first sentence hints at this:
“TRUE! — nervous — very, very dreadfully nervous I had been and am; but why will you say that I am mad? (…) Harken! and observe how healthily — how calmly I can tell you the whole story.”
We don’t even find out his name by the end of the story. It begins in media res, meaning in the middle of a conversation between the unreliable narrator and an unnamed character. He starts out very confident, stressing how calmly he can tell us what happened, trying to get us to trust him. Throughout the story he tries to reassure us that he is of a sound mind, that an insane person couldn't possibly plot a murder and the disposal of the body in such detail --
"If still you think me mad, you will think so no longer when I describe the wise precautions I took for the concealment of the body."
He blames his very vaguely described disease for his impulsiveness that leads him to commit a murder which he by the end he confesses by blurting it out:
“"Villains!" I shrieked, "dissemble no more! I admit the deed! --tear up the planks! here, here! --It is the beating of his hideous heart!"”
His paranoia drives him to confession and the story ends rather abruptly there.