Disclaimer: Reviewing pre-publication paperback ARC/proof copy.
This wasn't the right fit for me, but the quality of writing and storytelling was excellent, so I'll try to give some detail so you can figure out if it's a match for your own tastes.
This is the story of five sisters as they try to save their father (the king) from a magical curse. Only, being as how they're sisters, they mostly fall prey to rivalries and selfishness and do more harm than good. It wasn't clear from the copy I had, but this looks like the first in a series, which makes a lot more sense. I found it pretty depressing, as it seems to be an excellent argument for sticking to one child per family, and it also delves into the sex lives (and terrible choices) of each sister, and as a general rule I find a person's sexuality to be the least interesting part of them. But, y'know, tastes differ and all that. It's adult fantasy, not really romance, so the scenes don't get excessively explicit or drawn out. Somewhere from 1-3 of the sisters have some level of spiritual/magical powers that get tangled with some potential psychosis, so that part was interesting and has potential. It was a surprisingly fast read considering its size.
I'm not terribly knowledgeable when it comes to high fantasy subgenres - this might be considered grimdark? Or crossover literary-fantasy? Not really to my tastes, but the writing was very well done and the storytelling was smooth, if a little slow at the start. It switches perspectives between all five daughters, their stepmother, their stepbrother, and maybe a couple more, I don't really remember, so that does make it hard to get into the story and build attachment to the characters up front. It was a fascinating choice in terms of storytelling and suspense, though, since it really lends itself to exploring the moral ambiguity and deceitfulness of characters. They each portray themselves as sympathetic and make observations on the others, and then you switch POV and get a different look at the same people and actions. So I think this would be an excellent book for the right reader (review: 3/5 for taste, 5/5 for quality), but just not right for me.