An unexpected love affair threatens a long-lived friendship in this soap opera–like debut from Atlanta ex-lawyer Giffin. Since elementary school, Rachel and Darcy have been best friends, with Darcy always outshining Rachel. While single Rachel is the self-confessed good girl, an attorney trapped at a suffocating New York law firm, Darcy is the complete opposite, a stereotypical outgoing publicist, planning a wedding with the handsome Dex. After Rachel's 30th birthday party, she knocks back one drink too many and winds up in bed with Dex. Instead of feeling guilty about sleeping with her best friend's fiancé, Rachel realizes that Dex is the only man she's really loved, and that she's always resented manipulative Darcy. Rachel and Dex spend a few weekends in the city together "working" while Darcy's off with friends at a Hamptons beach share, but finally Rachel realizes she'll have to give Dex an ultimatum. The flip job Giffin pulls off—here it's the cheaters who're sympathetic (more or less)—gives Dex and Rachel's otherwise ordinary affair extra edge. Rachel would be a more appealing heroine if she were less whiny about her job and her romantic prospects, and rambling dialogue slows the story's pace, but this is an enjoyable beach read—one that'll make readers cast a suspicious eye on best friends and boyfriends who seem to get along just a little too well.