A Susceptible Gentleman — Carola Dunn

She hardly knew whether to laugh or cry! she thought that the Viscount was a man of virtue, but when he returned from London to his country seat, a series of startling revelations forced her to readjust her thinking; she was then called upon to rescue him from his own folly at her expense; the truth was that he was a rake and a libertine beyond redemption, but she was determined to save him whether he liked it or not!

Hero: Adam Lancing, Viscount Cheverell
Heroine: Sarah Meade