Published in 1834, "Berenice" is Edgar Allan Poe's exploration of obsession and mental deterioration, featuring a narrator whose monomania—an unhealthy fixation on trivial details—becomes grotesquely focused on his cousin's teeth after her devastating illness. The story exemplifies Poe's interest in abnormal psychology and the fragile boundary between reason and insanity, delivering its horror through the narrator's unreliable perspective and repressed actions. Readers should expect a first-person confession of compulsion and madness that culminates in an act of unspeakable violation.