The professional reviews I read about this series said that it shouldn't be classed as YA, as it's just generally wonderful. Those reviewers are insane.
I really haven't been as frustrated with characters in a long while as I have with Marley's ice-world inhabitants. They're twits. They are brought up in a cross between a cloister and a snobby finishing school, and then are loosed on a world that's been trained to revere them. Now, this might be an interesting construct to take apart, but it's a damn boring one to celebrate. They're all teens, not only celibate (due to some handwavy explanation about "mating" ruining the Gift), but they appear to not really struggle with that directive. Bull.
I wouldn't mind so much if there was a really good excuse for celibacy here, but there's not! There's even some sort of parallel Singer system, a commercial track of gifted people who can marry and have families. But do we ever hear of a high-caste Singer CHOOSING to give up talent in exchange for a family? Nope. It's not even discussed. The one Cantrix who does get knocked up promptly dies in childbirth, essentially by giving up due to guilt. Good work, lady! So while Sira and her "renegade" band (who are so similar to the establishment they "changed" that it's literally indistinguishable) moan about not having enough talented children to train, it's pretty clear no one's bothered to reconsider that whole celibacy thing, despite itinerant Singers having gifted children. Augh!
That's not even getting into the plotline of this particular book, which appears to be "politically powerful girls discover hideous abuse of underlings, decide to look other way". Yep, those would be our heroines all right. But given that their fearless leader showed her smarts in the third book by threatening a man who she knew had a hostage as a show of force, then retreating... Honestly. The characters in these books are passive, and then dumb. And routinely invite totally inexplicable pain upon themselves by doing stupid things like separating to two different locations for years at a time, though there is no clear reason WHY they are doing so, and apparently it causes heartache.
Obviously, I did not like these books. The description was nice, the concept cool, but I really can't deal with lame characters and this series offers a slew of them, doing a host of stupid things. I come away with a prickly, uncomfortable feeling that this was some sort of religious screed? Something about sacrifice and loneliness and.... dude, I don't know. Maybe the author finds something noble and romantic in those ideas. But for me, this was like being snowed in with a gaggle of cloistered nuns. And not the cool nuns -- the arrogant, sheltered kind. Save yourself, etc.