How to Handle a Scandal — Emily Greenwood

They thought the debutante was scandalous
Miss Elizabeth Tarryton was the toast of the London Season the year she was seventeen and spurned young Tommy Halifax. A careless flirt who didn't know what she wanted, she was startled into laughter by his public proposal of marriage. Furious and heartbroken, Tommy promptly left home for a life of adventure in India.

If they only knew about the widow
Seven years later, Elizabeth has much to make up for, but the methods she chooses for doing good are as shocking as her earlier wanton behavior―should the ton ever find out. Tommy returns to England a hero, with no intention of allowing himself to be hurt by a woman ever again, but he's fascinated nonetheless by Elizabeth, now widowed and more alluring than ever.