I think this is the best of the Glamourist Histories, although that is partially because I prefer the books that range further from England and Austen rather than the ones that hew more closely to what's happening in London.
Also, I think that MRK is getting better at speaking Regency language in her text (although reading this right after [b: Jonathan Strange and Mr. Norrell|823762|Jonathan Strange and Mr. Norrell|Susanna Clarke|https://d.gr-assets.com/books/1396578618s/823762.jpg|3921305] is a study in contrasts and not entirely one that favors MRK). The extensive research works in her favor this time around. I'm glad the series ended on such a positive note for me and I really enjoyed this book.