This is the second book in her third (I'm assuming) trilogy. The first, Naamah's Kiss, was... a little unimpressive for me. I mean, her first three books (the Phedre books) were just mind-blowingly awesome, partly because of her terrific world-building but mostly because of the relationship between (who I consider to be) the two main characters. We're talking soul-crushing angst, here, and I mean that in a good way.
With the second trilogy, the Imriel books, while they weren't quite as strong (maybe I'm a rube, but cousins in love just... no), but they were able to build off the fantastic cast of characters from the previous books.
This current group of books takes place a good century (I think) later, with a very different set of characters. I found Naamah's Kiss to be fairly muddled: the heroine sets out to find her destiny, gets mixed up in some dark magic, becomes the queen's lover, takes a long voyage, there's some stuff with a dragon, yadda yadda. I don't know if it's just that I have no interest in femslash or dragons, or because I miss the old, made-of-win characters, but it all just left me a little... meh.
That said, I had to run out and by the sequel because (1) there's always the possibility that it gets better in this one and (2) it's Jacqueline freaking Carey, biotch.