More than a mistress
(Book)

Series numeration from Goodreads.

He is bad-tempered, reckless, a man superior in his abilities to charm and delight women. The greatest matrimonial prize in all of Christendom, he is the scandalous Duke of Tresham. When a young woman interferes in his Hyde Park duel, causing him to get shot, he hires her as his nurse, vowing that she will share his misery during his convalescence. Far too bold for her own good, Jane Ingleby is the kind of woman a man might find beautiful were it not for her impudence. She questions the duke's every move, scolds his bad manners, breaches his secrets, and touches his soul. When Tresham offers to set Jane up in his London town house, love is the last thing on his mind. And hers. Trying to pretend it is strictly business, an arrangement she must accept in order to conceal a dangerous secret, Jane suspects there is nothing more perilous than being the lover of such a man. Yet as she gets past his devilish facade and sees the noble heart within, she discovers the greatest jeopardy of all--a passion that drives her to risk everything on one perfect month with the improper gentleman who thinks love is for fools.