I have always enjoyed Sahara Kelly's historicals. Erotic Romance they may be, but she has a lot of detail and careful layering of social mannerisms and highlights of the time period (whatever it happens to be) as well.
Rogue's Diamond is no exception. La Diamante, brilliant mistress of the Ton, put it all behind her to become simply Miss Ennis Cranbourne (her given name), simple dressmaker in the country. Ennis doesn't regret her decision to become a high-ranked courtesan, for which I applaud her. She made the choice, with a clear goal in mind, and left when she realized she could no longer follow through. Strong-willed and determined to carve her own life.
The scene in Fowler's office is all kinds of fun as Ennis tries to piece together what Rogue is about, Fowler tries several times to (unsuccessfully) insult Ennis and Rogue alternates between shoving Fowler's nasty face into a disgrace he can't handle--verbally and physically.
And Rogue...well Rogue is delicious sounding and at the end he comes through admirably in the end, but we learn very little about him. He's a Colonel, Irish and he earned his rank through battle not papers. The sex is hot. I won't deny that one bit. Kelly always writes her scenes with enough detail and discreetness to make a reader sigh in longing.