When was the last time you were scared while watching a horror movie? And I mean really scared, the kind of freaked-out that stays with you long after the movie is over. A24's new horror movie, Undertone, does just that. The Canadian film, out now in theaters nationwide, achieves what few other films in the genre accomplish - it projects real menace and suggests evil is lurking right behind you. It's 2026's scariest film to date and joins recent films like Hereditary and Skinamarink as superior examples of elevated horror.