Something Wicked This Way Comes by Claire Delacroix

Seven years ago, Sophia Brisbane lost everything—her father, her brother, her family fortune—but worse, was rejected by the man she loved. She’s determined not to yearn for the past and its pleasures—until she encounters Lucien de Roye again. Although he knew Sophia could never be his own, Lucien vowed to retrieve her squandered inheritance—even wagering his very soul to a demon. When Sophia learns what he has done, no force on heaven or earth will convince her to let him pay the demon’s due, no matter what the cost to herself.