Lockbox horror film trailer released by Diamond Films

Diamond Films has released a new trailer for the supernatural horror film ‘Lockbox’ (A Caixa do Demônio), scheduled for theatrical release on October 22, 2026. Directed by Daniel Stamm, known for ‘The Last Exorcism’, the film is inspired by an episode of the ‘Knifepoint Horror’ podcast.

The plot follows Ellen (Carla Gugino), who moves to the small town of Pontiac following her mother's death. She welcomes her cousin Winthrop (Lou Taylor Pucci), an Army veteran dealing with past trauma. His arrival coincides with a series of inexplicable and supernatural events that lead townspeople to suspect him. Ellen must investigate the mysterious force targeting Winthrop while navigating the blurred lines between psychological trauma and a real supernatural threat.

The cast includes Carla Gugino, Lou Taylor Pucci, Katharine Isabelle, Donald Sales, Roman Kinsella, and Jason McKinnon.