Movies - Lockbox: Daniel Stamm Returns to Supernatural Horror With an Original Adaptation of Soren Narnia's Cult Podcast

By Mulder, 24 june 2026

After quietly evolving under the working title Winthrop, Daniel Stamm's latest horror feature has officially emerged as Lockbox, a supernatural thriller that is positioning itself as one of the genre's most intriguing releases of summer 2026. Scheduled to open exclusively in U.S. theaters on July 3 through Aura Entertainment, the film reunites the filmmaker behind The Last Exorcism with psychologically driven supernatural storytelling, this time adapting The Lockbox, one of the most celebrated stories from Soren Narnia's acclaimed Knifepoint Horror podcast. The production stars Carla Gugino, Lou Taylor Pucci, and Katharine Isabelle, with Justin Yoffe adapting the story for the screen while Kearie Peak produces alongside Dark Castle Entertainment, Peak Pictures, and Capstone Studios. Development on the project was first announced in June 2025 under the title Winthrop before the production officially adopted the more enigmatic Lockbox in June 2026, a title that better reflects both the original source material and the film's central mystery.

Rather than relying on conventional possession-movie formulas, Lockbox appears determined to build its horror around uncertainty. The story follows Ellen, played by Carla Gugino, who retreats to an isolated rural community following the death of her mother in hopes of rebuilding her life while caring for her deeply traumatized cousin Winthrop, portrayed by Lou Taylor Pucci. Their fragile existence begins to unravel after a disturbed neighbor warns Ellen that Winthrop himself is dangerous. Strange manifestations quickly escalate until Ellen finds herself defending him from an ancient supernatural force intent on reclaiming him. While early synopses simply described a woman risking everything to protect her cousin from a terrifying entity, the official press materials reveal a richer emotional foundation centered on grief, inherited trauma and the complex bond between family members, suggesting that the supernatural elements function as much as metaphors as outright horror.

Perhaps the film's greatest asset is its literary origin. Soren Narnia's Knifepoint Horror has spent years cultivating an unusually devoted audience through understated storytelling, slow-burning dread and carefully constructed psychological tension rather than traditional jump scares. The Lockbox has become one of the podcast's most celebrated stories, making its adaptation a noteworthy event for longtime listeners. Unlike many horror adaptations that expand mythology into sprawling franchises, Lockbox appears committed to preserving the intimacy that made the original story resonate, with Justin Yoffe's screenplay reportedly focusing on emotional tension before revealing the supernatural dimensions lurking beneath the surface. That emphasis on character over spectacle aligns closely with the reputation Daniel Stamm established throughout his career.

The director himself offers perhaps the strongest indication of what audiences should expect. In an unusually candid director's statement included in the official production notes, Daniel Stamm explains that the screenplay reached him with almost no introduction—simply a message insisting, "You've got to read this." What immediately struck him, he says, was the script's refusal to resemble anything already on the market. Rather than pitching itself as The Exorcist... on a boat, as he jokingly describes many modern horror scripts, Lockbox continually defied his expectations, changing direction each time he believed he understood where the story was headed. One revealing anecdote illustrates his creative philosophy: whenever he evaluates a screenplay, he asks himself whether removing every horror element would still leave a compelling drama. According to Stamm, no previous script had passed that test as convincingly as Lockbox, reinforcing his belief that the emotional core—not merely the supernatural mythology—would carry the film.

Another particularly refreshing insight from Daniel Stamm concerns modern movie marketing. Having experienced trailers revealing too much of The Last Exorcism, he openly admits he worries the same could happen here. In the production notes he humorously recalls that the central mystery of one of his earlier films was spoiled within the first eighteen seconds of its trailer despite taking ninety minutes to unfold in the finished movie. Consequently, he half-jokingly encourages audiences to avoid the trailer altogether if they want to experience Lockbox exactly as intended, preserving the film's central question: "What's wrong with this guy?" That rare honesty from a filmmaker reflects both his confidence in the screenplay and his desire to protect the carefully engineered suspense his cast and crew spent months creating.

Casting further strengthens those ambitions. Carla Gugino, whose recent genre work in Gerald's Game, The Haunting of Hill House and The Fall of the House of Usher has cemented her status as one of horror's most respected dramatic performers, anchors the emotional side of the story. Opposite her, Lou Taylor Pucci takes on the demanding role of Winthrop, a deeply damaged young man whose true nature remains deliberately ambiguous throughout the narrative. Completing the central trio is Katharine Isabelle, whose legacy within horror, particularly following Ginger Snaps, gives the production additional credibility among genre fans. Supporting performances include Jed Rees, Donald Sales, Madeleine Kelders, Samantha Ferris, Mercedes De La Zerda, Kevin McNulty, Jason McKinnon and Susan Hanson, while contortion performer Troy James, famous for his unsettling physical performances, portrays one of the film's demonic manifestations, hinting that practical creature work remains an important ingredient alongside visual effects.

Behind the camera, Daniel Stamm assembled collaborators capable of matching the film's atmospheric ambitions. Cinematography is handled by Alfonso Chin, editing by Bridget Durnford, and the original score is composed by Matthew Rogers, while the extensive visual effects work is overseen by Ingenuity Studios. Principal photography took place during the summer of 2025 in and around Vancouver, including Langley, British Columbia, with the production acknowledging the traditional territories of several First Nations communities where filming occurred. The official production notes also confirm a 105-minute running time and an R rating, placing Lockbox firmly within adult-oriented supernatural horror rather than mainstream PG-13 territory.

Although Daniel Stamm is widely associated with possession stories thanks to the commercial success of The Last Exorcism and later Prey for the Devil, Lockbox appears to represent something more personal. His own reflections repeatedly emphasize originality, emotional complexity and mystery rather than spectacle. Combined with Soren Narnia's understated storytelling, Justin Yoffe's adaptation, and a cast led by Carla Gugino, the project has all the ingredients to stand apart in a crowded horror landscape. Whether audiences choose to follow the director's tongue-in-cheek advice and avoid the trailer remains to be seen, but one thing is already clear: after beginning life as Winthrop, Lockbox has evolved into one of the more intriguing supernatural horror releases of 2026, inviting viewers not simply to confront evil, but to question where it truly comes from.

Synopsis : 
A woman risks her life to protect her cousin, Winthrop, who is being hunted by a powerful supernatural force.

Lockbox
Directed by Daniel Stamm
Written by Justin Yoffe
Based on The Lockbox by Soren Narnia
Produced by Kearie Peak
Starring  Carla Gugino, Lou Taylor Pucci, Katharine Isabelle
Cinematography : Alfonso Chin
Edited by Bridget Durnford
Music by Matthew Rogers
Production companies : Peak Pictures, Capstone Studios, Dark Castle Entertainment
Distributed by Aura Entertainment (United States)
Release date : July 3, 2026 (United States)