The Duke’s Untamed Desire by Amy Jarecki

He’s the most notorious rake in London… Though he uses the reputation to his advantage, the exotic Duke of Evesham is misunderstood and mysterious. He sidles around societal rules, especially when it comes to pursuing a wife. Though when he sets his sights on Lady Georgiana, the rules find a way of bending on their own accord.
She has no intention of courting anyone… The consummate bluestocking is in London for one thing—to find a financier for her late husband’s fire engine. And after six years away from the ton, Georgiana realizes social codes of conduct are different for widows—especially for ladies who catch the attention of the Duke of Evesham—the one man from whom the lady harbors a ghastly secret.
But fate has a way of making opposites attract… And when this pair unite, the sparks between them are hotter than blue fire. But will Lady Georgiana’s secrets lead to their demise? Or can the devilish duke find it in his heart to forgive the woman who has claimed his mind, body, and soul?