The Devil and the Viscount — Mary Lancaster

Rollo Darblay has been going to the devil for most of his adult life, thanks to frustrated ambitions and natural hedonism. When his father dies, leaving him finally in charge of ruined finances and failing estates, there is only one solution left: to marry money. Except the available choices crush his free spirit.

Gina Wallace, the dutiful daughter of a wealthy Manchester mill owner, is reluctantly betrothed to an ageing earl. But when she encounters the wickedly handsome Rollo at Renwick's Hotel, she is tempted to seek a little happiness before sacrificing herself to family obligation.

Neither bargains for falling in love, or the ensuing tangle of duty, duels, and promises that cannot be broken. Will they abandon their families for true love? Or find a way that satisfies both?

Note: This series is part of Dragonblade's Flame line, so this is a sexy, steamy, and scorching-hot read with multiple sex scenes. Be advised.