Mara, Sadie, and Hannah are friends first, scientists always. Though their fields of study might take them to different corners of the world, they can all agree on this universal truth: When it comes to love and science, opposites attract and rivals make you burn….

Viola Bowen has the chance of a lifetime: to design a video game based on her all-time favorite book series. The only problem? Her co-lead is Jesse F-ing Andrews, a.k.a. her arch-nemesis. Jesse has made it abundantly clear over the years that he wants nothing to do with her–and Viola has no idea why. When their bosses insist a wintery retreat is the perfect team-building exercise, Viola can’t think of anything worse. Being freezing cold in a remote mountain lodge knowing Jesse is right next door? No, thank you.

Like an avenging, purple-haired Jedi bringing balance to the mansplained universe, Bee Königswasser lives by a simple code: What would Marie Curie do? If NASA offered her the lead on a neuroengineering project—a literal dream come true after years scraping by on the crumbs of academia—Marie would accept without hesitation. Duh. But the mother of modern physics never had to co-lead with Levi Ward.

The many lives of theoretical physicist Elsie Hannaway have finally caught up with her. By day, she’s an adjunct professor, toiling away at grading labs and teaching thermodynamics in the hopes of landing tenure. By other day, Elsie makes up for her non-existent paycheck by offering her services as a fake girlfriend, tapping into her expertly honed people-pleasing skills to embody whichever version of herself the client needs. Honestly, it’s a pretty sweet gig—until her carefully constructed Elsie-verse comes crashing down.

As a third-year PhD 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.

Bad luck has always followed Olivia Marshall...or maybe she's just the screw-up her family thinks she is. But when a "What are you wearing?" text from a random wrong number turns into the hottest, most entertaining - albeit anonymous - relationship of her life, she thinks things might be on the upswing.

Mallory Greenleaf is done with chess. Every move counts nowadays; after the sport led to the destruction of her family four years earlier, Mallory’s focus is on her mom, her sisters, and the dead-end job that keeps the lights on. That is, until she begrudgingly agrees to play in one last charity tournament and inadvertently wipes the board with notorious “Kingkiller” Nolan Sawyer: current world champion and reigning Bad Boy of chess.

Misery Lark, the only daughter of the most powerful Vampyre councilman of the Southwest, is an outcast—again. Her days of living in anonymity among the Humans are over: she has been called upon to uphold a historic peacekeeping alliance between the Vampyres and their mortal enemies, the Weres, and she sees little choice but to surrender herself in the exchange—again...

Stella Lane thinks math is the only thing that unites the universe. She comes up with algorithms to predict customer purchases - job that has given her more money than she knows what to do with as well as way less experience in the dating department than the average 30-year-old. It doesn't help that she has Asperger's and that French kissing reminds her of a shark getting its teeth cleaned by pilot fish. She decides that she needs lots of practice - with a professional - which is why she hires escort Michael Phan.

Evie Jones has dedicated her life and very limited funds working for Southern Service Paws, the company that matched her with the love of her life: Charlie, a service dog trained to assist with her epilepsy. But it’s no secret that the company has been struggling to make ends meet. It’s up to her and her longtime mentor and boss to throw the fundraiser of the century to keep the doors open.

Rosie Graham has a problem. A few, actually. She just quit her well-paid job to focus on her secret career as a romance writer. She hasn’t told her family and now has terrible writer’s block. Then, the ceiling of her New York apartment literally crumbles on her. Luckily she has her best friend Lina’s spare key while she’s out of town. But Rosie doesn’t know that Lina has already lent her apartment to her cousin Lucas, who Rosie has been stalking—for lack of a better word—on Instagram for the last few months.

Scarlett Vandermeer is swimming upstream. A Junior at Stanford and a student-athlete who specializes in platform diving, Scarlett prefers to keep her head down, concentrating on getting into med school and on recovering from the injury. She has no time for relationships. Swim captain, world champion, all-around aquatics golden boy Lukas Blomqvist thrives on discipline. It’s how he wins gold medals and breaks records: complete focus, with every stroke. On the surface, Lukas and Scarlett have nothing in common. Until a well-guarded secret slips out, and everything changes.

If Darcy Barrett hadn’t met her dream man when she was eight years old, the rest of the male population wouldn’t be such a let-down. No one measures up to Tom Valeska, aka the best man on Earth, not in looks, brain, or heart. Even worse is the knowledge that her twin brother Jamie saw him first, and claimed him forever as his best friend. Tom’s off limits and loyal to her brother, 99 percent. One percent of Tom has had to be enough for Darcy, and her adoration has been sustained by his shy kindness. And if she’s honest, his tight t-shirts.

Mackenzie Carter has had some very bad dates lately. Model train experts, mansplainers, guys weirdly obsessed with her tail—she hasn’t had a successful date in months. Only a year out of residency, her grandmother’s obsession with Mackenzie finding the perfect mate to settle down with threatens to drive Mackenzie barking mad. Out of options, it feels like a small thing to tell her grandmother that she’s met someone. That is, until she blurts out the name of the first man she sees and the last man she would ever date: Noah Taylor, the big bad wolf of Denver General.

After years of working her tail off at her event-planning business, Maggie Mitchell is ready for a vacation. With nothing on her mind but R & R, she’s enjoying the warm weather of Bora Bora when in saunters Brody McFadden, her brother’s best friend and also her sworn enemy. Thanks to years of tension between the two—kicked off by a make-out session at her brother’s wedding that ended horribly—Maggie has sworn to stay away from the man. That is, until she finds out he’s in Bora Bora for his boss’s daughter’s wedding, hoping to use the trip to win a real future at the company.