I read this book many many years ago and loved it. It is a wonderfully written book, definitely one of Lisa Kleypas' classics. Bow Street Runner rescued the virgin sister of a famous courtesan. The attraction is steamy and the lead characters very likely.
What I find a bit unsettling is I never really knew whether the hero liked the heroin or her sister. The mistaken identity is naturally the big plot in the book. It did make me wonder, is he attracted to the heroin, really? Or it is her sister that he lusts after and the poor girl was just a replacement?
Overall a very entertaining story. I would still rate it 5 stars. The characters are extremely lovable and you just want them to be together.
Read this book!! The story will stay with you for a long time, as it did with me.