The Instant New York Times Bestseller and TikTok Sensation! As seen on THE VIEW! 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. An Indie Next Pick! "A literary breakthrough… The Love Hypothesis is a self-assured debut, and we hypothesize it's just the first bit of greatness we'll see from an author who somehow has the audacity to be both an academic powerhouse and divinely talented novelist."— Entertainment Weekly “ C ontemporary romance's unicorn: the elusive marriage of deeply brainy and delightfully escapist... The Love Hypothesis has wild commercial appeal but the quieter secret is that there is a specific audience, made up of all of the Olives in the world, who have deeply, ardently waited for this exact book.”—Christina Lauren, New York Times bestselling author “Funny, sexy and smart, Ali Hazelwood did a terrific job with The Love Hypothesis .”—Mariana Zapata, New York Times bestselling author “This tackles one of my favorite tropes—Grumpy meets Sunshine—in a fun and utterly endearing way...I loved the nods towards fandom and romance novels, and I couldn't put it down. Highly recommended!”—Jessica Clare, New York Times bestselling author "Pure slow-burning gold with lots of chemistry."—Popsugar "A beautifully written romantic comedy with a heroine you will instantly fall in love with, The Love Hypothesis is destined to earn a place on your keeper shelf."—Elizabeth Everett, author of A Lady's Formula for Love "Smart, witty dialog and a diverse cast of likable secondary characters...A realistic, amusing novel that readers won’t be able to put down."— Library Journal, starred review "Hilarious and heartwarming, The Love Hypothesis is romantic comedy at its best...a perfect amalgamation of sex and science, sure to appeal to readers of Christina Lauren or Abby Jimenez."—Shelf Awareness "With whip-smart and endearing characters, snappy prose, and a quirky take on a favorite trope, Hazelwood convincingly navigates the fraught shoals of academia...This smart, sexy contemporary should delight a wide swath of romance lovers."— Publishers Weekly Ali Hazelwood is the #1 New York Times bestselling author of Love, Theoretically and The Love Hypothesis, as well as a writer of peer-reviewed articles about brain science, in which no one makes out and the ever after is not always happy. Originally from Italy, she lived in Germany and Japan before moving to the US to pursue a PhD in neuroscience. When Ali is not at work, she can be found crocheting, eating cake pops, or watching sci-fi movies with her three feline overlords (and her slightly-less-feline husband). Chapter One   Hypothesis: When given a choice between A (a slightly inconveniencing situation) and B (a colossal shitshow with devastating consequences), I will inevitably end up selecting B. In Olive's defense, the man didn't seem to mind the kiss too much.   It did take him a moment to adjust-perfectly understandable, given the sudden circumstances. It was an awkward, uncomfortable, somewhat painful minute, in which Olive was simultaneously smashing her lips against his and pushing herself as high as her toes would extend to keep her mouth at the same level as his face. Did he have to be so tall? The kiss must have looked like some clumsy headbutt, and she grew anxious that she was not going to be able to pull the whole thing off. Her friend Anh, whom Olive had spotted coming her way a few seconds ago, was going to take one look at this and know at once that Olive and Kiss Dude couldn't possibly be two people in the middle of a date.   Then that agonizingly slow moment went by, and the kiss became . . . different. The man inhaled sharply and inclined his head a tiny bit, making Olive feel less like a squirrel monkey climbing a baobab tree, a