Whistle is an upcoming teen horror film directed by Corin Hardy and written by Owen Egerton. It stars Dafne Keen, Sophie Nélisse, Sky Yang, Jhaleil Swaby, Ali Skovbye, Percy Hynes White, Michelle Fairley and Nick Frost. From Wikipedia
An R-rated teaser follows high school misfits unleashing an Aztec death whistle’s fatal curse ahead of its 2026 theater debut.