A Rogue’s Reckoning by Jane Charles

Lord Seth Claxton embraced the life of a rogue: brandy, women, gambling. His luck with cards led him to establishing his own gambling den from which his wealth grew. That is, until those who usually sat at his tables started gambling at a more respectable establishment owned by his cousin.
For Miss Frances Hawthorn, the limited prospects of who she might marry were uninspired. While many misses had a sea of gentlemen from whom they could choose, hers had always been limited due to a lack of dowry. Thus, Frances retired to the side of the ballroom, happy to claim her wallflower status, and was determined to forge her own path.
What she had not counted on was a gentleman from her past upsetting the balance of her perfect world. Now she fully intends to have her revenge by beating the rogue at his own game.