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.

Rue Siebert might not have it all, but she has enough: a few friends she can always count on, the financial stability she yearned for as a kid, and a successful career as a biotech engineer at Kline, one of the most promising start-ups in the field of food science. Her world is stable, pleasant, and hard-fought. Until a hostile takeover and its offensively attractive front man threatens to bring it all crumbling down.

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.

Cat should be afraid of Brigan—the devastatingly gorgeous stranger at a Halloween party whose very presence makes everyone else fall at his feet. But while his supernatural allure drives others to mindless obsession, Cat somehow keeps her wits…even as she surrenders to temptation. When this cursed being realizes she alone can see his true nature, one night of searing passion could break a centuries-old spell—or doom them both.

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.

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.

Chandler Cohen has never felt more like the ghost in "ghostwriter" until she attends a signing for a book she wrote—and the author doesn’t even recognize her. The evening turns more promising when she meets a charming man at the bar and immediately connects with him. But when all their sexual tension culminates in a spectacularly awkward hookup, she decides this is one night better off forgotten. Unfortunately, that’s easier said than done.

The proposition is simple: if ER nurse Claire Harper and her roommate, firefighter Graham Scott, are still single by the time they’re forty, they’ll take the proverbial plunge together…as friends with benefits. Maybe it’s the wine, but in the moment, Claire figures the pact is a safe-enough deal, considering she hasn’t had much luck in love and he’s in no rush to settle down. Like, at all. Besides, there’s no way she could ever really fall for Graham and his thrill-seeking ways. Not after what happened to her father.

Wells Whitaker was once golf’s hottest rising star, but lately, all he has to show for his “promising” career is a killer hangover, a collection of broken clubs, and one remaining supporter. No matter how bad he plays, the beautiful, sunny redhead is always on the sidelines. He curses, she cheers. He scowls, she smiles. But when Wells quits in a blaze of glory and his fangirl finally goes home, he knows he made the greatest mistake of his life.