“The Love Hypothesis” lands on Prime Video on September 23, adapting Ali Hazelwood’s hit rom-com

Amazon is bringing Ali Hazelwood’s bestselling romance novel to the screen with “The Love Hypothesis,” a new rom-com that will stream globally on Prime Video starting September 23.

The film stars Lili Reinhart as Olive, a Ph.D. candidate in the sciences who ends up caught in an arrangement with Adam, played by Tom Bateman. The central premise pairs the two characters in a fake relationship, setting up the story’s mix of workplace tension, awkward chemistry, and eventual emotional payoff.

The announcement also ties the adaptation to Hazelwood’s popularity in the romance category. Hazelwood’s novel has been described by Amazon as a New York Times bestselling romance book, placing the project in a well-known lane of genre content built for streaming audiences.

Rounding out the cast, the film includes Rachel Marsh as Olive’s best friend Ahn, and Nicholas Duvernay as Olive’s crush, Jeremy. Amazon’s release positions these supporting roles as key to the character network that drives the story’s social and romantic stakes.

For Prime Video, the title fits a familiar strategy: adapting proven IP that already has a built-in fan base, then packaging it as premium, scalable entertainment for a global subscriber base. Romantic comedies are a long-running staple for streamers because they can perform well across demographics while still delivering a clear genre promise to viewers.

The “The Love Hypothesis” project also reflects the streaming industry’s broader push toward serialized-style storytelling even in single films. Hazelwood’s book centers on a distinctive setting (academia and scientific careers) that helps differentiate the romantic-comedy format from more traditional meet-cute fare.

Still, Amazon has not disclosed performance expectations, viewership targets, production budget, or whether the company plans to frame the release as part of a larger marketing push with additional related content. Without that data, it is difficult to gauge how the studio will measure success beyond the release window and audience reception.

What to watch next is how Prime Video markets the film around its release date, including whether promotional coverage highlights Hazelwood’s readership, the film’s science-and-academia premise, or the star power of Reinhart and Bateman. Viewers will also likely look for how closely the adaptation tracks the novel’s tone, particularly the balance between banter and sincerity that defined the book’s popularity.