Spoiler notice: This spoiler-free story guide is based on Amazon’s official synopsis and does not reveal how Olive and Adam’s relationship ends.
Olive understands research better than romance.
She is a talented PhD candidate concentrating on her academic future when her best friend, Ahn, develops feelings for Jeremy—the man Olive previously liked. Olive insists that she has moved on, but Ahn is reluctant to pursue him without proof.
Under pressure to demonstrate that her feelings are over, Olive makes an impulsive decision. She kisses the first available man she sees.
Unfortunately, that man is Dr Adam Carlsen, one of the most intimidating professors in her department.
The kiss should produce embarrassment, an apology and a quick escape. Instead, it becomes the beginning of a fake relationship neither scientist expected to conduct.
Why Olive needs a fake boyfriend
Olive’s problem begins with loyalty.
She wants Ahn to feel free to pursue Jeremy without believing she is betraying her friend. Olive could continue explaining that she is no longer interested, but words have failed to convince Ahn. The unexpected kiss gives Olive something that looks like evidence.
If she is dating Adam, then she must have moved on.
The explanation is false, but it solves Olive’s immediate problem. Adam also has reasons to cooperate, turning one awkward moment into a mutually useful arrangement.
They establish boundaries and agree to present themselves as a couple. The relationship exists for practical reasons, and both believe that clear rules will prevent it from interfering with their real lives.
That confidence becomes their first untested hypothesis.
Adam Carlsen’s reputation
Tom Bateman plays Adam, a professor known for being brilliant, demanding and difficult to approach.
His reputation makes him a strange choice for Olive’s romantic performance. Other students do not expect warmth from him, which means every public sign of affection attracts attention. Olive cannot quietly claim to be seeing Adam without people noticing how unlikely the pairing appears.
Adam’s intimidating manner also hides how carefully he observes her.
He agrees to the arrangement rather than dismissing the kiss as a foolish mistake. Whatever practical benefit he receives from the fake relationship, spending time with Olive brings him outside the controlled professional identity everyone associates with him.
The more believable they become to other people, the more difficult it becomes to identify which parts are still an act.
Romance inside the laboratory
The academic setting gives the story more than scientific jokes and laboratory equipment.
Olive is building a career in an environment shaped by competition, funding, research opportunities and professional reputations. She cannot separate her personal decisions from the department where she works. Pretending to date a professor therefore creates complications that would not exist in an ordinary fake-dating arrangement.
Rumours can affect how colleagues see her achievements. Adam’s position creates questions about boundaries and influence. Even if the arrangement benefits both of them, they must consider how it appears to people who do not know the truth.
The film must handle that power difference carefully. Olive needs to remain an active participant whose ambitions exist independently of Adam, while the romance must never suggest that her career matters only because an influential man notices her.
When the rules begin failing
Olive and Adam attempt to treat their relationship like a controlled experiment.
They define the arrangement, establish its purpose and expect a predictable result. What they cannot control is the effect of repeated closeness.
Pretending requires them to spend time together, learn each other’s habits and provide support that begins feeling less artificial. Their public relationship creates private moments neither included in the original agreement.
Olive must eventually confront an uncomfortable possibility: the performance may have revealed something genuine.
Admitting that possibility carries risk. If Adam does not feel the same way, she could lose the arrangement, damage their working relationship and create fresh complications inside the department. Remaining silent may feel safer, but it also means continuing an experiment after the answer has become clear.
Friendship remains important
Ahn is not simply the person who creates the misunderstanding.
Olive’s friendship with her explains why she begins the deception, but it also gives the story an emotional relationship outside the central romance. Olive is willing to embarrass herself because she wants her friend to be happy.
Rachel Marsh plays Ahn, while Nicholas Duvernay portrays Jeremy. Their relationship develops alongside Olive and Adam’s arrangement, creating an ironic contrast. The romance built on honest attraction may appear simpler than the one built on a carefully organised lie.
Jaboukie Young-White and Arty Froushan also appear in the supporting cast.
How closely is it connected to the novel?
The Love Hypothesis is adapted from Ali Hazelwood’s bestselling novel.
The film retains the book’s defining foundation: Olive’s impulsive kiss, Adam’s intimidating reputation, the fake-dating agreement and the gradual confusion between performed affection and genuine feeling.
Claire Scanlon directs from a screenplay by Sarah Rothschild. Lili Reinhart plays Olive and also serves as an executive producer, while Tom Bateman portrays Adam.
A film adaptation must condense Olive’s internal thoughts and parts of the academic world developed in the novel. The important question is whether it preserves her intelligence, friendships and professional objectives instead of reducing the story to the familiar image of a difficult man becoming romantic.
What viewers should expect
This is a romantic comedy built around fake dating, contrasting personalities and scientific language.
It should appeal to viewers who enjoy:
Book-to-screen romance adaptations
Intelligent heroines with demanding careers
Fake relationships that become emotionally complicated
Reserved characters gradually becoming vulnerable
Friendship-driven romantic decisions
University and research settings
Lili Reinhart and Tom Bateman
Viewers do not need to read Hazelwood’s novel first. The movie is designed to introduce Olive, Adam and their arrangement as a complete screen story.
Flicklevel story outlook
The clever part of The Love Hypothesis is not simply that two scientists fall in love. It is that both enter the relationship believing they understand its limits.
Olive approaches the arrangement as a solution to someone else’s romantic problem. Adam accepts rules that should keep the situation manageable. Neither expects repeated affection to produce evidence against their original assumptions.
For the adaptation to work, Olive’s academic life must carry as much weight as her feelings for Adam. Her story becomes more satisfying when love adds to the future she is building rather than replacing it.
The Love Hypothesis premieres globally on Prime Video on September 23, 2026.
Official source: Amazon – The Love Hypothesis