Surprised by a Duke: A Regency Romance (Classic Regency Romance #1)
Susan Leona Fisher

She realises at once that he is the same man who helped her save Pru from an embarrassing moment at a Children’s Ball held by his mother six years earlier. He clearly doesn’t remember her, but nevertheless vows to help her uncover the truth about her parents’ deaths. Meanwhile, as she falls deeper in love with him, she has to watch hopelessly as his mother undertakes her campaign to find him a suitable wife among the haut ton.