Spells, Sisters, and Sieges: Inside Gregg Bishop’s Supernatural Thriller The Heretiks
Main Facts
At this year’s Fantastic Fest, genre filmmaker Gregg Bishop unveiled his latest cinematic nightmare, The Heretiks, a high-stakes horror film that merges the familiar, claustrophobic dread of a home-invasion thriller with the volatile, arcane mechanics of modern witchcraft. Written by the dynamic duo Luke Piotrowski and Ben Collins, The Heretiks centers on two estranged sisters trapped under siege on Halloween night. Instead of standard-issue weapons like firearms and bludgeoning tools, the combatants wield incantations, hexes, and counterspells.
The film stars Kimberly Epstein as Cai, a renegade witch who attempts to protect two vulnerable sisters—Ada, played by Josie Wert, and Mabel, played by Ava Mae Seidensticker—from the vengeful coven she recently abandoned. While the premise relies heavily on supernatural lore and high-octane spectacle, the beating heart of the movie is a grounded, complicated exploration of sibling dynamics, trauma, and unconditional love. Clocking in as a thrillingly mean-spirited ride, The Heretiks manages to subvert traditional subgenres, delivering a narrative that is as emotionally resonant as it is terrifying.
Chronology
The genesis of The Heretiks began long before its festival premiere, born out of a collaborative writing process between Piotrowski and Collins. Recognizing an opportunity to reinvent the stale tropes of the home-invasion subgenre, the writers crafted a screenplay that swapped physical barricades for mystical boundaries.
When Bishop—known for his work on Dance of the Dead and Siren—read the script, he immediately recognized its potential. "Luke and Ben wrote the script," Bishop noted during interviews at Fantastic Fest. "They had a great, interesting take on it, and I just fell in love with it."
On-set production required rapid character development, particularly for the actors portraying the central sisters. Because the script plunges the audience directly into the action without a prolonged expository setup, Josie Wert and Ava Mae Seidensticker had to construct their characters’ history on the fly. On the morning of their first day shooting together, the actors established their backstory through a quick conversational exercise.
"I’m Mabel, you’re Ada," Seidensticker recalled of their preparation process. In Seidensticker’s interpretation, Mabel harbored underlying resentment, feeling that her older sister had abandoned her for college life. Wert countered this by emphasizing the heavy emotional toll placed on Ada, noting that the script "does hint to some trauma involving their parents." This tightrope walk between familial responsibility and individual independence defined the sisters’ dynamic throughout the chaotic events of the film.
Supporting Data and Production Insights
To understand the unique flavor of The Heretiks, one must look at how Bishop synthesized his cinematic influences. By fusing the home-invasion template with monster-movie mythology, Bishop and his creative team designed a cinematic playground where magical rules dictate the physical danger.
- Directorial Lineup: Gregg Bishop (Dance of the Dead, Siren)
- Screenwriters: Luke Piotrowski and Ben Collins
- Main Cast:
- Kimberly Epstein as Cai (the renegade witch)
- Josie Wert as Ada (the protective older sister)
- Ava Mae Seidensticker as Mabel (the younger sister)
- Core Subgenre Blend: Home-invasion thriller meets supernatural witch-lore
- Tone: Described as a harsher, more adult evolution of classic Halloween-themed supernatural cinema—akin to a significantly darker, bloodier successor to 1993’s Hocus Pocus.
Bishop structured the production to ensure the film functioned primarily as an entertaining amusement-park ride for horror fans, but he also insisted on maintaining narrative depth. The introduction of the coven’s unique mythology provides a textured background, while the sisters’ grounded relationship anchors the high-concept chaos.
Furthermore, themes of community and vulnerability run deep within the narrative. According to Josie Wert, the film explores what it truly means to welcome an outsider, moving past polite pleasantries to examine the messy reality of "loving people through their flaws."
Official Responses and Creative Vision
Director Gregg Bishop has been vocal about his motivations for tackling The Heretiks, emphasizing that beneath the visual splendor of spells and counterspells lies a deeply human story.
"I’ve seen a thousand home invasion movies, so that’s where I started with Gregg Bishop at Fantastic Fest," reviewers noted, highlighting the filmmaker’s self-aware approach to genre tropes. By introducing supernatural elements, Bishop felt he could completely flip expectations. "Instead of axes and guns, you get spells and counterspells," he explained.
Bishop also stressed that while the surface appeal involves supernatural violence and holiday-themed terror, the foundation of the story is distinctly personal. Drawing on his own experiences with family, Bishop referred to The Heretiks as "a very female story" that is "also a very human story." He credited Piotrowski and Collins for successfully layering multiple thematic elements into the screenplay, ensuring that the supernatural conflict feels genuinely threatening because audiences care deeply about the human characters at stake.
The cast echoed these sentiments, pointing out that the narrative avoids easy character archetypes. Cai’s betrayal of her coven, Ada’s protective burden, and Mabel’s youthful angst all contribute to a complex web of motivations that elevate the film above standard B-movie horror fare.
Implications for the Horror Genre
The Heretiks arrives at a fascinating time for the horror genre, which has increasingly embraced elevated storytelling that uses supernatural or monstrous elements to explore real-world trauma and interpersonal relationships.
Subverting the Home-Invasion Formula
For decades, home-invasion thrillers have relied on a strict set of rules: an isolated location, aggressive intruders, and a desperate family fighting for survival using everyday objects. By substituting physical hardware with arcane magic, The Heretiks revitalizes a tired formula. The tension shifts from "Can they lock the door?" to "Can our magic outlast their magic?" This innovation opens up new storytelling avenues for filmmakers looking to blend micro-budget intimacy with fantastical world-building.
The Power of Female-Centric Horror Narratives
Moreover, the film capitalizes on the massive critical and commercial success of female-led horror. By centering the conflict on a triad of women—two estranged sisters trying to heal old wounds and a renegade witch seeking redemption—the movie subverts patriarchal horror tropes. The threat is not merely an external monster, but a manifestation of toxic community control and broken familial bonds.
Ultimately, The Heretiks proves that while dazzling special effects and clever spellwork provide the initial hook, enduring horror must be anchored by genuine emotional stakes. As Bishop and his cast demonstrated at Fantastic Fest, the true magic of the film isn’t just in the incantations cast on screen, but in the unbreakable bond of the sisters fighting to survive them.
