Narrator and point of view

The short story “The Tell-Tale Heart” by Edgar Allan Poe is told by a first person narrator, who is also the main character of the story.

The narrator occasionally uses the second person, seemingly addressing the readers or the police: “You fancy me mad. Madmen know nothing. But you should have seen me. You should have seen how wisely I proceeded” (p. 155, ll. 3-5). This gives the impression that he is telling the story to an audience, and that he assumes his audience to be sceptical towards him. 

The narrator is clearly unreliable. This is made evident right from the beginning of the story, as he tries to explain to the readers that he is not mad, even though both the way he talks and the things he has done clearly point to madness...