William Wilson by Edgar Allan Poe

A proud, morally corrupted narrator recounts being shadowed by an uncanny double who shares his name and appearance and repeatedly thwarts his worst impulses, serving as a conscience and ruinously exposing him at school and in society; tormented, the narrator confronts and fatally stabs the double, only to discover in a mirror that he has in fact killed himself, leaving a grim meditation on guilt, identity, and the destructive power of the self.

Purchase from Bookshop.org