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There is something specifically wrong about horror that happens in bright sunshine on white sand. It shouldn’t work. Scary things are supposed to happen in the dark, not on a sunny beach. Yet, here we are.

The genre has spent decades training audiences to associate danger with darkness. Shadows, fog, rain, winter, the absence of light. Remove all of those cues and drop the horror into a tropical afternoon and trained horror fans no longer know what to look for.

The Cognitive Dissonance

We are conditioned to believe paradise is safe. Blue water, palm trees, sunlight. These are vacation images. Relaxation images. Nothing bad is supposed to happen here.

Daylight horror is one of the hardest subgenres to execute because there is nowhere to hide the ugliness. In darkness, the imagination fills gaps. In sunlight, everything is visible, and the film has to make that visibility the threat.

What results is a specific kind of dread. The feeling that the pleasant surface of things is a lie, and always has been.

Midsommar and What Daylight Does

Midsommar is the most discussed recent example, a film set almost entirely in golden Swedish summer light where the horror is hyper-visible by design. There is no darkness to retreat into. Every ritual, every atrocity, happens in front of everyone, in full color, in the sun.

The film’s director of photography Pawel Pogorzelski described the approach as weaponizing the light. Making the brightness feel oppressive rather than comforting. There is no relief. The beauty of the setting becomes part of the trap.

The setting promises safety and delivers the opposite.

Key West Was Always Haunted

Key West has a specific advantage for horror that most tropical settings don’t, it’s actually dark underneath. The Spanish named it Cayo Hueso, “island of bones,” for the human remains found scattered on its beaches when they arrived. It has been shaped by disease, hurricanes, shipwrecks, piracy, slavery, and execution.

In 1996, David L. Sloan founded what became the first professional ghost tour operation in the United States, right there in Key West. The island’s paranormal history wasn’t invented for tourism. The tourism caught up with what was already there.

The palm trees and turquoise water are real. So are three centuries of unquiet dead.

Tropical Horror in the Genre

The Ruins, Triangle, and the broader tradition of island and beach horror keep returning to paradise as the place where the worst things happen. The genre returns to these settings because they keep working. The contradiction between beauty and violence never gets old.

The tropical setting also erases the usual horror toolkit. No dark forests, no ruined buildings, no convenient fog. The monster has nowhere to hide. Neither does anyone else.

Which Is Exactly Why We Set Our Horror Movie There

iHorror is making a horror-comedy called Key of Bones: Curse of the Ghost Pirate, filmed entirely on location in Key West. Not as a backdrop. In Key West specifically, because Key West is not actually paradise. It just looks like it.

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No one would blame you for looking at Thinestra and thinking, “oh, it’s The Substance again.” Both films use an underexplained beauty product as a way to navigate how women are treated in entertainment and the pressure to always be beautiful. While The Substance goes after how women are treated in front of the camera, Thinestra gives us a glimpse behind the scenes.

It has things to say. Whether it says them clearly is a different question.

Meet Penny

Our protagonist is Penny, a young visual editor played by Michelle Macedo. Specifically, she edits the photos of paper thin models. She is surrounded by perfection all day and none of it is hers. After asking one of the models what it feels like to be perfect, she is handed a mystery pill with no explanation.

Something in the Ozempic family, as the film frames it, which is a good choice given that we are living through a cultural moment where weight loss drugs are reshaping beauty standards in real time. After struggling with her size for a bit, Penny pops the thing and waits to see what happens. You know, normal Tuesday activity.

What happens is that the weight she loses comes back. As her. Penelope, played by Michelle’s actual identical twin, Melissa Macedo, shows up as the ravenous doppelganger Penny just shed. The twin casting is not a gimmick. It is the smartest thing the film does. There is something genuinely uncanny about watching two identical people share a frame when one of them is supposed to be the literal embodiment of everything the other one is running from.

All of this plays out against a sweltering Los Angeles Christmas, which is its own kind of horror.

The Good Stuff

The first thing that comes to mind when watching Thinestra is odd. This is not a derogatory remark. Odd is always good in horror. The film features a toilet twin, a donut chamber, and a surprising amount of evil food. All of these things work beautifully for the comedy side of the film. Director Nathan Hertz has a clear vision for the film’s more absurdist moments and those moments land.

Hertz has said in press materials that “Penelope is not the villain. She is the symptom. The real antagonist is the voice in Penny’s head that tells her she is not enough.” That is a genuinely good thesis. The film knows what it is trying to do. Whether it follows through is the issue.

Where It Falls Apart

Thinestra never finds its balance between drama and comedy. Some scenes are over the top silly while others go immediately deadpan. The film is engaged in a kind of tonal whiplash that makes it difficult to stay invested in what is actually happening to Penny on an emotional level. You get pulled out right when you should be pulled in.

The special effects have the same problem. The donut dungeon looks disgusting and wonderfully delicious all at once, and it works. Some of the body horror effects do not hold up as well. It is worth noting that this is an indie production and budget has a lot to do with that. But the inconsistency is still noticeable in a way that undercuts the scarier moments.

The Bigger Picture

Thinestra comes from a long line of feminist body horror, and it genuinely tries to tackle heavy subjects. The Ozempic framing is timely in a way that The Ugly Stepsister and The Substance were not quite working with, and that specificity gives the film a sharp cultural edge when it leans into it. The problem is that it does not always lean into it. It gets distracted by its own weirdness, which is charming, but removes the atmosphere that would make the horror actually hurt.

This is not a bad film. Thinestra is funny, gross, and imaginative in ways most Hollywood films are not. It took home the VORTEX Sci-Fi, Fantasy and Horror Award Grand Prize on the festival circuit and screened at Sitges, Raindance, and Screamfest, among others. There is real craft here and real ambition.

But in a genre that is currently producing work as precise as The Ugly Stepsister and as unrelenting as The Substance, Thinestra does not quite make its impression. It has the right ingredients. It just needed a longer cook time.

Where to Watch

Thinestra is streaming now via Breaking Glass Pictures.

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Full disclosure: I know almost nothing about Aztec culture. I am not a historian, and I am not a scholar. I am a horror writer who watched a Mexican psychological thriller at midnight and cried about it. The good news is that none of my ignorance matters, because Sacrificios is not making an argument you need a textbook to follow. It is making an argument that is written into every parent who has ever sat at a hospital bedside and thought, take me instead.

You will understand this film completely. I promise.

One more thing before we get into it. The first fifteen minutes have some effects that are a little rough around the edges. Push through. I am serious. Whatever you think is happening in those opening scenes is not representative of what this film becomes. Stay in your seat.

What Is Actually Happening

Juan is a father. His young son dies. Then the ocean gives him back.

That is the setup, and the film is smart enough not to over-explain it. Director Mauricio Chernovetzky and co-writer Alexander Ioshpe are not interested in the mechanics of the miracle. They are interested in the price. And the price is this, to keep his son alive, Juan has to feed him his own blood. Not metaphorically. Literally. The child drinks from his father until there is nothing left to drink.

You know, light family viewing.

The Sacrifice Thing Is The Whole Movie

I want to sit with this for a second because it is genuinely one of the more brutal premises I have encountered in recent horror, and the film earns every drop of it.

There is something ancient about the image of a father slowly pouring himself out, so his child can live. I am not qualified to tell you where exactly this imagery lives in the specific cultural tradition the film is drawing from. What I can tell you is that it did not need to explain itself to me. The act translates. A parent giving everything they have, past the point of survival, so their child does not have to face whatever comes next. That is not a Mexican idea or an Aztec idea. That is a human idea. It has been a human idea for as long as humans have had children they could not bear to lose.

Chernovetzky has said this film is dedicated to his and Ioshpe’s fathers, and that the question driving the whole thing was, is there a limit to how much a father would be willing to sacrifice? The grief, the silence, the weight carried alone. Watching Juan answer that question over 92 minutes is not comfortable. It is not supposed to be.

The film asks what you would trade for one more day. And then it makes you watch Juan trade everything.

The Dreamlike Stuff

The film lives in the same territory as Jacob’s Ladder and The Witch, which the filmmakers themselves have cited as touchstones. That is a confident comparison to make, and they back it up. You are never fully sure what is real and what is happening inside Juan’s collapsing mind, and the film is deliberate about keeping you in that uncertainty. The dreamlike quality is not atmosphere for its own sake. It is the logic of grief. When you are inside that kind of loss, the line between what happened and what you are imagining happening gets very thin very fast.

Cinematographer Grzegorz Bartoszewicz shoots the Mexican landscape like it knows what Juan did. There is a heat and a weight to every frame. The wrongness is baked in from the beginning, so when things fall apart it feels less like a reveal and more like an inevitability.

The Cast

Jorge Jimenez, who you know from Narcos and The Black Demon, is carrying this whole thing on his face, and he does not drop it once. The specific acting challenge here is playing a man who has made a decision the audience understands completely and would probably make themselves, while also making it clear that the decision is destroying him.

Does It Land

Co-writer Ioshpe said that at the 2025 Austin Film Festival, audiences stood in the wings waiting to share their own stories of grief and loss after screenings. The film won the Audience Award there and now makes its Latin American premiere at the 22nd Fantaspoa International Fantastic Film Festival in Brazil this April. That trajectory tells you what you need to know about whether it works emotionally.

It does. This is a slow burn that earns its slow. If you are here for jump scares, wrong movie. If you are here for something that is going to sit quietly in the back of your head for a few days and occasionally tap you on the shoulder, you found it.

Get past the first fifteen minutes. Stay until the end. Try not to call your dad on the way home.

No promises on that last one.