The Rake and the Heiress — Marguerite Kaye

Any virtuous society lady would know to run a mile from Mr. Nicholas Lytton. But Lady Serena Stamppe, returning from exile in France, is blissfully unaware of this rake's reputation. In any case, he just happens to be the one person who can help unlock the mystery surrounding her inheritance.

Accepting Nicholas's offer of assistance, Serena soon discovers the forbidden thrills of liaising with a libertine -- excitement, scandal...and a most pleasurable seduction!