Thinestra, the debut feature from Nathan Hertz, is a sly body horror that premiered at the 2025 edition of the Raindance Film Festival. Horror was well represented at Raindance 2025, with a total of 16 genre feature films selected for the festival; Thinestra aside, these included eye-popping giallo homage Saturnalia, anthology sequel Dui Shaw, Slovenian shocker Hole, Paul Raschid's riotous interactive movie The Run, and lockdown tale Our Happy Place. While laughter may not have been the top criterion for those who explored the festival's horror offerings, Thinestra was almost certainly the funniest film in the strand.
The world has long been fascinated with the concept of beauty and the lengths to which individuals will go to maintain it. Thinestra takes this obsession as a starting point for a cautionary tale which examines some of the cosmetics industry's often overlooked darker aspects, all the while considering the psychological impact of impossible beauty standards. Indie musician Michelle Macedo plays Penny, a body-conscious, downtrodden LA photo retoucher whose life descends into chaos when Mariah (Mary Beth Barone), a model working at the same studio, offers her a new unlicensed weight loss drug called Thinestra.
Mariah hands over the medication with a warning that it—like the film itself—is seriously strong stuff that won't suit everyone. What could possibly go wrong? Naturally, Penny proceeds to take the tablets, and dramatic weight loss duly follows. But this shedding of pounds, as you would only expect, comes at a price, which takes the shape of the birth of Penny's ravenous, uninhibited doppelgänger (played by Macedo's twin sister and bandmate Melissa), who craves human flesh as much as Penny does body perfection. Thus, Penny's enjoyment of her new physique is tempered by her double's violent, erratic behaviour.
Set during Christmastime in a sweltering LA, Thinestra often recalls Coralie Fargeat's The Substance, and Nathan Hertz's assured debut will hopefully find a suitable audience as it arrives in the wake of one of last year's most talked-about films. But the influence of Julia Ducournau's Raw can also be felt here, and it is refreshing to note that Hertz's key reference points appear to be works by female francophone directors who are broadly aligned with the New French Extremity. Thinestra is an oddly affecting film, and its humour and gloopy FX, while enjoyable, belie a serious message regarding society's fixation with the superficial.
Darren Arnold






































