Warning: This article contains MAJOR SPOILERS for The Watchers and the book on which it’s based.The 2024 film The Watchers is based on a 2022 horror-lit book of the same name by A.M. Shine, with some significant changes made to the source material. The lore in the book and film originates from Irish folklore of faeries and changelings, which A.M. Shine grew familiar with from his history degree from the University of Galway in Ireland. The film was adapted and directed by Ishana Shyamalan, daughter of M. Night. The Watchers book and film both have mixed reviews, with many of the movie’s changes to the story proving particularly contentious.