The Duke's Accidental Wife - Dukes of War, #7

An enemies-to-lovers, marriage-of-inconvenience romance from a New York Times bestselling author:  Miss Katherine Ross is a wealthy, eccentric socialite who knows precisely what she wants: No husband. No children. No candlelit tête-à-tête with the insufferably emotionless Duke of Ravenwood. She's convinced his heart is ice - until she touches that chiseled chest for herself. One lapse in judgment is all it takes to turn both their lives topsy-turvy... The Duke of Ravenwood isn't cold and haughty, but a secret romantic who has always dreamt of marrying for love.
Instead, he gets Miss Katherine Ross - a headstrong hoyden intent on unraveling his carefully ordered world. He doesn't know whether to kiss her or throttle her. Can they survive each other's company long enough to turn a compromise into love? The fan-favorite Dukes of War series features roguish peers and dashing war heroes who return from battle only to be thrust into the splendor and madness of Regency England.