Adair, Marina. Sugar, Georgia series.

"Charlotte Holden, Sugar's favorite pediatrician, knows better than anyone that love only leads to heartbreak. Instead, she's focused on creating the Grow Clinic, an outpatient center for children. All she has to do now is to host the best Founder's Day Parade in the history of Sugar, Georgia, to win over a big-city donor. Easy as peach pie. Then sexy Jace McGraw blows back into town and utters those three words every woman dreads: we're still married. Jace McGraw was making an offer on his dream business in Atlanta when he was told that his wife had some credit issues. Wait, his wife? The annulment went through years ago-or so he thought. He'd walked away only to keep his troublemaker reputation from ruining her dreams. But now that they have a second chance, Jace offers Charlotte a deal: he'll grant a discreet divorce in exchange for 30 days and nights of marriage. Because this time he isn't going to let her go without a fight" --