Mississippi Matchmaker by Melissa Klein

Diana Curtis works hard to grow her businesses and look after her scatterbrained Mama in a charming, southern mansion. So, when Miss Jackie returns from vacation engaged to an English Duke, Diana will do whatever it takes to stop the impulsive marriage. She'll even join forces with the Duke's handsome but secretive nephew.

Tracking his uncle, the card-counting Viscount, Andrew Montgomery, leaves Monte Carlo to stop the duke from making an embarrassing blunder and prevent anyone from learning just how few zeros are in the family's bank account. While attempting to stop the wedding, Diana and Andrew find their growing connection impossible to ignore. With old family secrets exposed, Diana and Andrew must decide if their love is strong enough to withstand divided loyalties, crazy relatives, and unexpected truths.