The Love Hypothesis

The Instant New York Times Bestseller and TikTok Sensation!

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A BuzzFeed Best Summer Read of 2021

When a fake relationship between scientists meets the irresistible force of attraction, it throws one woman's carefully calculated theories on love into chaos.


As a third-year Ph.D. candidate, Olive Smith doesn't believe in lasting romantic relationships—but her best friend does, and that's what got her into this situation. Convincing Anh that Olive is dating and well on her way to a happily ever after was always going to take more than hand-wavy Jedi mind tricks: Scientists require proof. So, like any self-respecting biologist, Olive panics and kisses the first man she sees.

That man is none other than Adam Carlsen, a young hotshot professor—and well-known ass. Which is why Olive is positively floored when Stanford's reigning lab tyrant agrees to keep her charade a secret and be her fake boyfriend. But when a big science conference goes haywire, putting Olive's career on the Bunsen burner, Adam surprises her again with his unyielding support and even more unyielding...six-pack abs.

Suddenly their little experiment feels dangerously close to combustion. And Olive discovers that the only thing more complicated than a hypothesis on love is putting her own heart under the microscope.

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Published Sep 14, 2021

400 pages

Average rating: 7.79

2,001 RATINGS

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What Bookclubbers are saying about this book

✨ Summarized by Bookclubs AI

Readers say *The Love Hypothesis* by Ali Hazelwood is a charming, addictive romcom with witty banter, relatable STEM characters, and sweet fake-dating...

Groundhogcat
Oct 24, 2025
6/10 stars
Nice romance. One steamy chapter.
CurvyAndNerdy
Jul 20, 2025
10/10 stars
I absolutely love Ali’s writing. As a woman in STEM it adds a relatable layer not often found in romances. Olive was not the most self aware of heroines. It was a bit frustrating at times but I loved getting her inner thoughts and rationalizations. Adam was phenomenal. I loved his dryness, surliness, and inexperience just as much as his assertiveness when he finally got what he wanted. I can’t wait to read the interconnected books.
__thebookspace
Jul 04, 2024
7/10 stars
Easy read, I really enjoyed this! Some scenes were 🌶️🌶️ but I wish there was a bit more exploration of pancreatic cancer and about difficulties women in STEM face. I didn’t like the age difference between the main characters, it was like 12 years..💀 which was a bit mad. But overall really enjoyed the book and loved the ending! Looking forward to reading more of her work.
Denise Lauron
May 19, 2024
10/10 stars
I picked this up on a whim. I loved that it revolved around women in STEM. Smart women can have romances, too.

The bonus chapter at the end showed part of the book from the male love interest's point of view. Very interesting take on it. I am glad that the book didn't alternate POV, since it would have given away a lot of the story. The reader was better off being in the dark, just like the main character was.

This was a fun read. I would recommend it.
Chloë
Feb 19, 2026
6/10 stars
My hypothesis is that the farther away I stay from love, the better off I will be.

And thus runs Olive's inner dialogue throughout this story, as she deals with the ramifications of randomly kissing 'known ass' Adam Carlsen.

I'm finding it hard to rate, honestly, and articulate why. So I'll keep it in the middle. Did I enjoy it? For the most part. My biggest pet-peeve with contemporary romance is the oft-used miscommunication trope, and while there is an element of that between Olive & Adam, it's presented in a slightly different way so I didn't find is as egregious. But still, there was just something...lacking.

Something about Olive just didn't connect with me, and I don't know why. I appreciated the elements of childhood trauma, abandonment issues & impostor syndrome that she dealt with, which should make you want to root for a character, but I just couldn't. Maybe because she still came across as juvenile? I don't know. She had some great banter with Adam, and I do believe there was great chemistry between the two. When they finally do the deed, I found it one of the best written scenes of intimacy I've read recently in a CR, but having really only the single scene was a bit of a let down.

Anyways, I'll stick with a solid 3* - I think it could have used a bit more polishing, but it is otherwise a cute, neither good nor bad, little story.

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