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….

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.

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.

Holly is dealing with the impending death of her grandmother and still reeling from a bad breakup. One bright spot: a Valentine’s Day card on Holly’s windshield—even if it wasn’t meant for her. An amusing mistake soon turns into a lovely exchange of anonymous notes, little acts of kindness, and a growing affection between two strangers. What happens when one of them has to say goodbye?

Adored by all, Britta is an ambitious waitress working at Sluggers. The popular bar holds a special place in her heart and is a regular hangout for the Bridgeport Bandits, the local hockey club. With a half brother on the team, Britta has a strict no-dating policy for hockey boys. But she does have a soft spot for one particular player.

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...

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.

Suddenly unemployed and on the brink of eviction, Cassie Evans is left with two choices: get a new job (and fast) or fire up her long-untouched OnlyFans account. But the job market is terrible, and as for OnlyFans. . . . Well, there are reasons she can’t go back. Just when all hope seems lost, an ad for a live-in nanny position seems like the solution to all her problems. It’s almost too perfect—until she meets her would-be employer.

Catalina Martín desperately needs a date to her sister’s wedding. Especially since her little white lie about her American boyfriend has spiraled out of control. Now everyone she knows—including her ex and his fiancée—will be there and eager to meet him. She only has four weeks to find someone willing to cross the Atlantic and aid in her deception. New York to Spain is no short flight and her raucous family won’t be easy to fool. Enter Aaron Blackford—her tall, handsome, condescending colleague—who surprisingly offers to step in.

Hi, my name is Bree Camden, and I’m hopelessly in love with my best friend and star quarterback Nathan Donelson (so is half of America, judging by the tabloids and how much the guy dates). The first step is admitting it, right? Except, I can never admit it to him because he clearly doesn’t see me that way, and the last thing I want is for things to get weird between us. Nothing but good old-fashioned no-touching-the-sexiest-man-alive platonic friendship for us! Everything is exactly how I like it! Yes. Good. (I’m not crying; I’m just peeling an onion.)

Hannah Brooks looks more like a kindergarten teacher than somebody who could kill you with a wine bottle opener. Or a ballpoint pen. Or a dinner napkin. But the truth is, she’s an Executive Protection Agent (aka "bodyguard"), and she just got hired to protect superstar actor Jack Stapleton from his middle-aged, corgi-breeding stalker.

One typo, and a boy and girl connect by chance. Wishing each other a happy Valentine’s Day isn’t the end. In fact, it becomes a friendly annual tradition—with rules: no pics, no real names, nothing too personal. As years pass, the rules for their email “dates” are breaking, and they’re sharing more than they imagined—including the urge to ask…what if we actually met?

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.