This is a rerelease of one of the earlier stories. I read Paragon walk in 1986 and enjoyed the story immensely but if you are following the series through and you are wondering if the title rings a bell you are right it does. This is the old days Thomas Pitt is still just an inspector and Emily is married to Lord Ashworth. Still a cracking read but you could become confused if you don't realise it's one of the early novels.
I have read this book previously and am now three quarters of the way through it again. I am enjoying it very much as it is one of the early books and therefore includes Charlotte and Emily helping Inspector Pitt in his investigations. Although I have read all the later ones, they have become more politically based and not, to me, as enjoyable. I will probably look at buying the Kindle edition of Callander Square, the second book in the series.