An inexperienced governess arrives at a remote country estate to care for two orphaned children, only to find herself entangled in a terrifying struggle against malevolent spectral forces. Tasked with the education and protection of young Miles and Flora, the protagonist finds her reality fracturing as she perceives figures from the past haunting the grounds of Bly. She must navigate the unsettling silence of the housekeeper and the increasingly cryptic behavior of her charges, all while questioning the validity of her own perceptions. The narrative unfolds through a frame story, utilizing a first-person perspective that forces the reader to confront the ambiguity between supernatural intrusion and psychological collapse.

This novella occupies a central position in the canon of psychological horror, frequently analyzed for its deliberate lack of resolution. Readers and critics alike often debate whether the ghosts are objective entities or projections of the governess's own fractured psyche. The text is noted for its ability to sustain high levels of anxiety through suggestion rather than overt violence. Its enduring status stems from this structural ambiguity, which invites endless re-examination of the narrator's credibility and the true nature of the children's behavior.