Introduction
One of BookTok’s most beloved romance novels is finally getting its screen adaptation, and after years of anticipation, the wait is almost over. Ali Hazelwood’s debut novel The Love Hypothesis — famously born as Reylo (Rey/Kylo Ren) fanfiction before becoming a full-blown publishing phenomenon — is coming to Prime Video, marking the very first on-screen adaptation of any Hazelwood book. With Lili Reinhart and Tom Bateman leading the cast, this is shaping up to be one of the fall’s biggest romance releases.
Quick Facts
| Category | Details |
|---|---|
| Based On | The Love Hypothesis (2021) by Ali Hazelwood |
| Director | Claire Scanlon (Set It Up) |
| Screenplay | Sarah Rothschild |
| Starring | Lili Reinhart, Tom Bateman |
| Supporting Cast | Rachel Marsh, Jaboukie Young-White, Nicholas Duvernay, Arty Froushan |
| Producer | Elizabeth Cantillon |
| Studio | Amazon MGM Studios / MRC Film (Bisous Pictures label) |
| Genre | Romantic Comedy / STEM Romance |
| Filming Location | Montreal, Canada |
| Filming Dates | July 11 – August 29, 2025 |
| Rating | R |
| Release Date | September 23, 2026 |
| Platform | Prime Video (streaming exclusive) |
Overview
The film follows Olive Smith (Lili Reinhart), a brilliant PhD candidate laser-focused on her future in academia. When she realizes her best friend Anh (Rachel Marsh) has developed feelings for Olive’s own crush, Jeremy (Nicholas Duvernay), Olive impulsively kisses the first man she sees to make it look like she’s moved on — who happens to be Dr. Adam Carlsen (Tom Bateman), the intimidatingly brilliant, notoriously prickly professor everyone in the department fears. What starts as an accidental, purely tactical kiss spirals into a fake relationship neither of them expected, testing whether two people who claim to only believe in scientific method and logic can actually fall for something as messy and irrational as love.
The Road to the Screen
Ali Hazelwood’s debut novel published in September 2021 and spent 40 weeks on the New York Times Best Seller list, becoming a defining title of the BookTok romance boom. Notably, the novel began as Reylo fanfiction — a Rey and Kylo Ren story from Star Wars — before Hazelwood reworked it into an original STEM-set romance. Bisous Pictures, the romance-focused label from producer Elizabeth Cantillon and MRC Film, first acquired the film rights back in October 2022. Casting news arrived nearly three years later: Lili Reinhart was confirmed as Olive Smith (also serving as executive producer) on July 16, 2025, with Tom Bateman announced as Dr. Adam Carlsen the very next day. Filming ran from July through late August 2025 in Montreal, and Prime Video confirmed the official September 23, 2026 release date on June 11, 2026 — with Reinhart and Bateman debuting the first teaser trailer live at the Obsessed Fest fan event on June 27, followed by a full official trailer on August 26.
The Reylo Connection That Won’t Go Away
Part of what makes this adaptation so fascinating to longtime fans is a layer of meta-commentary that’s impossible to ignore. The novel began life in 2018 as Hazelwood’s own fanfiction, titled “Head Over Feet,” built around the dynamic between Star Wars‘s Rey and Ben Solo/Kylo Ren (played by Adam Driver). Following the trailer’s release, that origin story resurfaced online in a big way — fans have been dissecting how much of that original “Reylo” dynamic survived the transformation into an original STEM romance, and some have even pointed out the meta-layer of naming the male lead “Adam,” a detail widely read as a wink to Adam Driver himself. Several TikTok reactions have specifically debated whether Tom Bateman’s take on Adam Carlsen captures the “shyly obsessed grump” energy that made the character work in prose, versus reading as a more conventional, cocky Hollywood rom-com love interest — a distinction longtime readers care about deeply.
Is It a Faithful Adaptation?
Ali Hazelwood herself has confirmed the film’s plot “wouldn’t be exactly the same” as the book, and reporting on the project notes some supporting characters have been reimagined, with changes made to streamline the story for a feature-length runtime. That said, early trailer breakdowns describe the adaptation as remarkably faithful overall — recreating fan-favorite moments including Olive and Adam’s first kiss, the widely-referenced “sunscreen moment,” the “bridal lift” scene, and their hotel room sleepover, while preserving the book’s core fake-dating premise, STEM academic setting, and slow-burn banter-heavy romance.
About That R Rating
One detail that’s generated real excitement (and some surprise) among readers: the film has been rated R. Given that Hazelwood’s novel has its fair share of “spicy” content, and film adaptations of steamy romance novels often get sanitized for a wider audience, the R rating is being read by many fans as a promising sign that the movie won’t shy away from the book’s more mature romantic content — a reassurance that’s come up repeatedly in early trailer reaction videos and podcast breakdowns.
Early Fan Reaction to the Trailer
Reaction to the first teaser and full trailer has been overwhelmingly enthusiastic. Even Ali Hazelwood herself weighed in publicly, responding “Oh my God, yeah” with visible approval when asked if she signed off on the casting. Fan commentary has focused heavily on how precisely Reinhart and Bateman seem to understand their characters’ mannerisms, even from just a few seconds of footage, with several reactors noting Bateman’s more restrained, closed-off performance style mirrors exactly the kind of emotionally guarded archetype that made Adam Carlsen so popular on the page. The film’s September 23 release date landing squarely in “pumpkin spice latte season” hasn’t gone unnoticed by fans either, who’ve pointed out the timing feels fitting for Olive’s own well-documented fondness for the same seasonal drink in the books.
Book vs. Movie: What’s Different (So Far)
Since the film hasn’t released yet, a full scene-by-scene comparison isn’t possible — but based on confirmed statements and trailer analysis, here’s what we know changes from the page to the screen:
Ali Hazelwood has confirmed the plot won’t be identical. Speaking at a book event, the author said plainly: “Of course, it’s going to be different from the book.” This is the most direct confirmation from the source herself that fans shouldn’t expect a beat-for-beat translation.
Several supporting characters have reportedly been reimagined. While Olive and Adam’s core dynamic remains intact, other characters in Olive’s orbit — including Anh, Malcolm, Jeremy, and Tom — appear to have been adjusted from their book counterparts to streamline the story for a feature-length runtime, according to early reporting on the adaptation.
The novel’s original Star Wars DNA has been fully scrubbed. Though the book began as Reylo fanfiction in 2018 (titled “Head Over Feet”), Hazelwood revised it extensively, removing virtually all direct Star Wars references before publication. The film adaptation naturally carries none of that DNA overtly — though the meta-commentary around Adam Carlsen’s name (a reported nod to Adam Driver) has kept the connection alive in fan discourse regardless.
The setting is confirmed as Stanford. Character descriptions for the film explicitly place Adam Carlsen as a professor at Stanford, giving the adaptation a concrete, named real-world setting for its academic backdrop.
Streamlined pacing is expected. As with most novel-to-film adaptations, certain subplots and interior monologue-heavy character development from the book are expected to be condensed or cut entirely to fit the film’s runtime — a common and unavoidable trade-off anytime a detailed, first-person POV novel becomes a two-hour visual medium.
What appears to be staying the same: based on the trailer, the fake-dating premise, Olive and Adam’s first kiss, the “bridal lift” scene, the sunscreen moment, and the hotel room sleepover all appear to be making the transition largely intact, giving book fans reassurance that the story’s most iconic moments haven’t been cut.
A fuller, spoiler-specific breakdown of exact plot differences will only be possible once the film actually releases on September 23, 2026 — check back after release for an updated comparison.
Highlights
- The first-ever Ali Hazelwood screen adaptation — with multiple hit novels to her name, this is a genuine milestone for her fanbase, who’ve waited years to see her signature “STEMinist” romance formula brought to life.
- Claire Scanlon directs — her prior work on Set It Up, another beloved streaming rom-com, gives fans real confidence in her ability to handle this genre.
- The trailer already delivers major book moments — including Olive and Adam’s first kiss, the much-discussed “sunscreen moment,” and their hotel room sleepover, giving readers early reassurance that key scenes are making the transition to screen.
- A grumpy-sunshine dynamic at its core — Adam’s intimidating, aloof exterior paired against Olive’s driven, quick-witted energy is the exact dynamic that made the book a phenomenon.
- Prime Video exclusive — unlike some adaptations that debut theatrically first, this one heads straight to streaming, making it easily accessible on release day.
Why You Should Watch It
- If you’ve read the book, this is your chance to finally see one of BookTok’s most iconic romances brought to life after years of anticipation.
- Lili Reinhart and Tom Bateman’s chemistry is already generating buzz from early trailer reactions, a good sign for the film’s central relationship.
- Claire Scanlon’s genre pedigree with Set It Up suggests a strong grasp of modern rom-com pacing and tone.
- It’s an easy, low-commitment watch — a single film rather than a series, perfect for a weekend romance binge.
- If you’re new to Ali Hazelwood’s work, this is a great entry point before diving into her other STEM romance novels.
Similar Movies and Shows
- Set It Up (2018) — director Claire Scanlon’s earlier hit rom-com, for a preview of her tone and pacing style.
- Love, Rosie or To All the Boys I’ve Loved Before — for more fake-relationship-turns-real romantic comedy structure.
- The Hating Game (2023) — another BookTok-beloved romance adaptation with a similar enemies-to-lovers office/workplace dynamic.
- Ali Hazelwood’s other novels (Love on the Brain, Check & Mate, the Bride series) — for readers wanting more of her signature romance formula while waiting to see if further adaptations get greenlit.
- Anyone But You (2023) — for fans of a similarly bickering, slow-burn central romantic pairing.
Conclusion
After nearly four years since the film rights were first acquired, The Love Hypothesis is finally almost here — and early trailer reactions suggest it’s delivering exactly what fans have been hoping for. With Lili Reinhart and Tom Bateman anchoring the central grumpy-sunshine dynamic and Claire Scanlon’s proven rom-com instincts behind the camera, this September 23 Prime Video release looks set to be one of the year’s most anticipated romance adaptations.
FAQs
When does The Love Hypothesis release? September 23, 2026, exclusively on Prime Video.
Who stars in The Love Hypothesis? Lili Reinhart as Olive Smith and Tom Bateman as Dr. Adam Carlsen lead the cast.
Who directed the film? Claire Scanlon, known for directing Set It Up.
Is this based on a book? Yes, it’s adapted from Ali Hazelwood’s 2021 bestselling novel of the same name.
Is this Ali Hazelwood’s first movie adaptation? Yes, this marks the first on-screen adaptation of any of her novels.
Will the movie be in theaters? No, it’s a Prime Video streaming exclusive.
Where was The Love Hypothesis filmed? Filming took place in Montreal, Canada, from July to August 2025.
What is the movie’s rating? It’s rated R, which many fans see as a promising sign the adaptation won’t shy away from the book’s more mature romantic content.
What’s different between the book and the movie? Ali Hazelwood has confirmed the plot won’t be identical to the book, with some supporting characters reimagined and the story streamlined for film. Key iconic scenes (the first kiss, the bridal lift, the sunscreen moment) appear to remain intact based on the trailer, though a full comparison won’t be possible until after the film’s release.
Is The Love Hypothesis really based on Star Wars fanfiction? Yes. The novel began as Hazelwood’s 2018 fanfiction titled “Head Over Feet,” inspired by the dynamic between Rey and Kylo Ren/Ben Solo from Star Wars, before being reworked into an original story.
Is Lili Reinhart involved beyond acting? Yes, she also serves as an executive producer on the film.