At Long Last by Shirley Busbee

To defend her legacy, Arabella Montgomery would make a pact with the devil himself. Her brother has gambled away the family's Natchez, Mississippi plantation, and only one man can help her get it back -- the arrogant yet dashing Tony Daggett, the man who had once cruelly toyed with her affections, and the man who has secretly never stopped loving her. Will their stormy alliance be strong enough to still warring hearts...and overcome the hidden enmey that plots theri destruction!