I have talked to several people (myself included) who expected to love The Countess Conspiracy very much from setup/prior introduction to characters in previous books, and found themselves oddly unmoved by the romance in it. It was composed of so many elements that should have worked for me! And yet it is probably my least favorite of that particular series, a fact which I rather regret.

Unveiled is also my least favorite of its particular series, so far as I'm concerned you can pretty much only go up with Milan from here. (Though Unraveled and Countess Conspiracy are both top-tier for me.)

(Though I would also very much recommend, if you're Exploring Romance Fiction, that you also give Rose Lerner's works a try.)