‘The Love Hypothesis’ Release Date, Cast, and Plot Explained Ahead of Its Prime Video Premiere

Ali Hazelwood’s breakout novel is finally making the leap from bestseller lists to the screen. ‘The Love Hypothesis’ is an American romantic comedy film adapted from the novel of the same name by Ali Hazelwood, directed by Claire Scanlon from a script by Sarah Rothschild.

The film has been building buzz for years, and with a concrete premiere date now locked in, fans of the fake dating trope are counting down the days. Here is everything confirmed so far about ‘The Love Hypothesis’ release timing, its cast, and the story it plans to bring to life.

The Love Hypothesis Release Date on Prime Video

Prime Video unveiled the release date for ‘The Love Hypothesis’ in early June, confirming the movie will officially debut on streaming on September 23, 2026. The film releases exclusively on Prime Video globally on that date.

The streamer confirmed the release date with a video on social media featuring star Lili Reinhart ordering a coffee drink with the date written on the cup. In the clip, Reinhart takes a sip from the coffee cup before asking the barista for sprinkles, while the cup itself reads 9.23 as a nod to the release date.

Fans hoping for a theatrical run will instead find ‘The Love Hypothesis’ as a streaming exclusive. Prime Video is included with an Amazon Prime membership, which costs 14.99 dollars a month or 139 dollars a year in the United States, with discounted memberships available for young adults and qualifying government assistance recipients. New subscribers can also access a trial period before committing to a full membership.

Meet the Cast of The Love Hypothesis

The film stars Tom Bateman and Lili Reinhart, alongside Rachel Marsh, Jaboukie Young-White, Nicholas Duvernay, and Arty Froushan. Jeananne Goossen and Aladeen Tawfeek round out the ensemble as well.

Reinhart leads the film as Olive Smith, a third-year biology PhD candidate whose carefully planned academic life takes an unexpected turn after she enters a fake relationship. Reinhart, known for ‘Riverdale’ and ‘Chemical Hearts,’ also serves as an executive producer on the adaptation.

Tom Bateman plays Dr. Adam Carlsen, Olive’s intimidating and famously difficult professor. The supporting cast includes Rachel Marsh as Olive’s best friend Anh Pham, Nicholas Duvernay as Jeremy Langley, Olive’s crush, and Jaboukie Young-White as Malcolm Browne.

Behind the camera, the film is produced by Elizabeth Cantillon, with cinematography by Matthew Clark, editing by Tia Nolan, and a score composed by Laura Karpman. It is a production of MRC Bisous Pictures and The Cantillon Company, distributed by Amazon MGM Studios through Prime Video.

What The Love Hypothesis Plot Is About

The official synopsis describes ‘The Love Hypothesis’ as following Olive, a brilliant PhD candidate focused on her future in academia. But when she realizes her best friend Ahn has fallen for her crush Jeremy, Olive impulsively kisses intimidating professor Adam Carlsen to prove she’s moved on.

What begins as a desperate act of friendship spirals into a fake relationship with rules, boundaries and a mutually beneficial agreement. When their arrangement begins to blur the lines between performance and reality, Olive is forced to test her most daunting hypothesis yet, that love might actually be worth the risk.

The book frames Olive as a PhD candidate studying cancer and trying to find a cure, who devises the fake dating scheme with the gruff Dr. Carlsen after their chemistry proves more complicated than either expected. The novel itself began as Reylo fanfiction before Hazelwood reworked it into a contemporary romance, with the male lead’s name serving as a nod to Adam Driver.

Hazelwood took the romance world by storm in 2021 with her debut novel, and has since published a number of other books about women in science finding love, usually paired with tall, aloof men who are secretly obsessed with them. With Hazelwood herself executive producing the adaptation, the film is expected to preserve the fake dating setup and central dynamic between Olive and Adam that made the book a hit.

The Love Hypothesis Trailer and What It Reveals

Reinhart and Bateman first unveiled a teaser trailer for the film at the Obsessed Fest fan event, before the full trailer arrived roughly a month before the premiere. The official trailer teases fan favorite book scenes, including Olive and Adam’s first kiss, the much discussed sunscreen moment, and a shared hotel room sequence.

The trailer shows Olive’s plan to convince her friend Ahn that it is acceptable to pursue her crush Jeremy, starting with an impulsive kiss with Adam and building into a full fake dating arrangement, with Olive telling Adam in his office that they are officially fake dating. Notably, the footage cuts off right before one of the most memorable chapters of the book, when Adam and Olive attend a science conference together.

Production on the film wrapped in September 2025, with Reinhart confirming the news through a TikTok video in which she and Bateman reenacted a farewell scene from ‘The Office.’ That kind of behind the scenes glimpse has helped keep the fan base engaged during the long wait between casting news and the finished film.

With a director known for grounded romantic comedy, a cast that has been building chemistry on social media for months, and a source novel that already has a devoted readership, ‘The Love Hypothesis’ arrives with expectations already set high. What are you most hoping the film gets right about Olive and Adam’s story when it finally lands on Prime Video this September.