Searxng/Undertone movie movie Movie A24's horror film Undertone divides critics & audiences. A podcaster investigates eerie audio recordings. Is it a chilling masterpiece or uneventful? April 10, 2026 AceShowbiz - Undertone, the latest R-rated supernatural horror from A24, has sparked mixed reactions since its theatrical release in March 2026. Premiering eight months earlier at the Fantasia International Film Festival, the film initially garnered positive critical attention, reflected in a solid 76% rating on Rotten Tomatoes.