The Money Man by Nancy Herkness

She’s small-town business. He’s Manhattan high finance. Together they ignite in a novel about unexpected love and danger by Nancy Herkness, award-winning author of the Wager of Hearts series.
New Jersey bookkeeper Alice Thurber has a carefully constructed risk-free life. Everything in perfect balance. Until little discrepancies show up in her clients’ accounts. Most would ignore it. Not the impeccably precise Alice. In desperation she reaches out to a high-powered consulting firm for help. New York City’s movie-star handsome financial wizard Derek Killion reaches back. All he has to do is smile and Alice’s fantasies stir. A girl can dream, can’t she?
A cofounder of KRG, Derek’s promise is to advise small-business owners in trouble. He never guessed that assisting the diffident but sexy Alice would be so captivating and make it so hard to keep his desires in check. But just as intriguing is the alarming puzzle behind the computer glitch that’s unsettled his client. As the investigation unfolds, they must also confront an attraction too palpable to ignore. Every new dark twist they follow is only bringing them closer together—in passion and in danger.