Mockumentary Comedy 'The Greatest Treasure in the World' Heads to Piru, California for August 2026 Shoot

An improvised mockumentary comedy feature is gearing up for a compact but creatively ambitious shoot in one of Southern California's most distinctive small towns, and the team behind it is actively casting and building out its production roster now. 'The Greatest Treasure in the World' is a feature film centered on the residents of a dying California town who find themselves competing for a mysterious inheritance, and it will be shot entirely in an improvised documentary format, including both scripted-adjacent ensemble scenes and direct-to-camera character interviews with a fictional documentarian. The production is set to film from August 17 through August 29, 2026, in Piru, California, making this a tight 13-day principal photography window that will demand a nimble, experienced crew comfortable working fast and staying flexible on set.

Directing is Alex Fernie, whose background in documentary and hybrid narrative work makes him a natural fit for a project leaning hard into the mockumentary form. The screenplay, or more precisely the framework and character architecture that will guide the improvisation, comes from writers Siobhan Thompson and Isabella Roland. Thompson is a performer and writer known for her long run at CollegeHumor, where she became a recognizable face in sketch and digital comedy, and her instinct for character-driven absurdist humor fits squarely within the tonal world this film is reaching for. Roland brings her own comedic sensibility to the collaboration, and together the two writers appear to have constructed the kind of detailed character infrastructure that successful improv-based features require, where the script is less a word-for-word blueprint and more a carefully engineered setup for actors to inhabit. The production name-checks Christopher Guest's 'Best in Show,' Errol Morris's oddball 2003 documentary 'Vernon, Florida,' and Chris Smith's cult classic 'American Movie' as tonal touchstones, which tells any crew member or actor considering this project a great deal about the register they're being asked to work in: dry, observational, deeply committed to character, and genuinely funny without winking at the audience.

The producing team is led by Marc Underhill, who is also serving as casting director, a dual role that reflects the intimate, hands-on scale of this production. Underhill is joined by producers Laser Webber and Alexandra Dennis, with Max Ash attached as executive producer. Underhill's involvement in casting while simultaneously producing suggests the team is approaching this project with a tight inner circle and a strong emphasis on finding exactly the right ensemble of performers who can sustain improvised character work across nearly two weeks of production. For casting directors, agents, and actors with strong improv backgrounds or mockumentary experience, this is a production worth reaching out to now.

The choice to shoot in Piru, California is one of the most interesting production decisions here and one that local crew and location-savvy professionals will immediately appreciate. Piru is a small, unincorporated community in Ventura County, tucked into the Santa Clara River Valley about 60 miles northwest of downtown Los Angeles. It is genuinely small, genuinely aging, and genuinely cinematic in that quiet, slightly time-warped way that productions seeking authentic Americana are drawn to. The town has been used as a filming location before, most notably serving as the primary stand-in for the fictional Charming, California in FX's 'Sons of Anarchy,' which shot extensively on its streets for years. That history means local residents and municipal contacts are familiar with the presence of film crews, and the surrounding Ventura County area has infrastructure to support a production of this scale. Los Angeles-based crew can drive to the location without the logistical burden of a distant location move, and the proximity to the Los Angeles crew base is a genuine practical advantage for a production operating on this kind of tight schedule and presumably modest indie budget.

The format and scale of this production point clearly toward a lean, collaborative union or non-union indie shoot. A 13-day principal photography schedule is ambitious, and the improvised documentary format will place particular demands on the camera department, the sound department, and the director's ability to capture spontaneous performance. Expect a small but highly skilled crew configuration: a DP comfortable with handheld, observational, vérité-influenced work; a sound mixer and boom operator experienced with the unpredictability of live improv performance; and a locations team already building relationships in Piru and the surrounding area. The art department, while unlikely to be large, will need to dress real locations to support the internal logic of the story's world. Given the tonal references and the indie scale, this production will likely attract crew who love the form and want to work on something genuinely creative, not just another studio tentpole.

With filming still more than six months out and the production currently in active pre-production and casting, the hiring window is open and moving. The full production listing for 'The Greatest Treasure in the World' is available now on ProductionList.com, where you can find production contacts, current crew attachments, and the Piru filming location details. If you work in camera, sound, locations, or casting and this kind of character-driven, improv-forward indie is your wheelhouse, now is the time to make contact. Listings like this one move quickly once the ensemble locks and the crew starts filling in around it.

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