A novel obsession / a novel Caitlin Barasch.

"Twenty-four-year-old bookseller and Manhattanite Naomi Ackerman is determined to write a novel-to prove the believers right and the disbelievers wrong (though she finds herself falling into both camps, depending on the day). When, after years of disastrous Tinder dates, she meets Caleb-a perfectly nice guy with a Welsh accent, a non-pretentious job, and a unique patience for all of her quirks-she feels she's finally found something to write about: the newness of love. But then, Rosemary enters the scene. When Naomi learns that Rosemary, Caleb's ex-girlfriend, is not safely tucked away overseas as she'd assumed but in fact lives in New York and works in the literary world, she is fundamentally threatened and intrigued in equal measure-if they both fell for the same man, they must have something essential in common, right? And is Rosemary the jilted ex who led Caleb to his true match, Naomi, or is it Naomi who is simply a bump in the road before Caleb and Rosemary find their way back together? Naomi is determined to find out how their stories intertwine... She is a writer after all. But when Naomi's casual Instagram stalking morphs into a full-blown friendship under false pretenses, she can't seem to get herself to quit Rosemary, in whom she finds an unexpected confidant-and she can't stop writing about her either, now having found the real perfect subject for her nascent novel. As things spiral out of her control, and fact and fiction become increasingly hard to separate, Naomi manipulates the most important people in her life in pursuit of her craft-her family, her friends, Caleb, Rosemary, and, perhaps most devastatingly, herself-until she's finally forced to decide who and what she's willing to sacrifice to write them all the perfect ending"-- Provided by publisher.