The more I think of this book, the more annoyed with it I get. It isn't bad in itself, but it left me with an aftertaste of wasted opportunities and rushed writing.
The core concept is solid: fairy tales are sort of real. They impose themselves onto reality and try to twist it, hoping to get reenacted. Unfortunately, they sometimes fail, and then you have Sleeping Beauties entering comas and dying before their prince ever gets to them (and taking entire villages with them), or Snow Whites poisoned by apples even in the most absurd ways. And that's great, I love the premise.
It is the job of a particular organization to stop fairy tales from doing much damage. Our heroes are a normal guy, a Snow White (who is doing her goddamned best to avoid all apples and ignore bluebirds and flowers on her carpet), a Wicked Stepsister (who is trying very hard not to kill people), a Pied Piper, and a Shoe-making Elf. None of them started out as fairy tale characters - they're real people whose lives have been twisted so they'd fit into stories, and now they're suspended with their stories incomplete.
Now, the narrative style is annoying. The author wrote Snow White as a first-person character, while every bit in the story that isn't hers is written in third person. It feels weird, like the narrator is omniscient, but very uncertain about whether they really ought to be. It annoyed the hell out of me to read "I saw Sloane" in one para and "Sloane was seen by Snow White" in the next. Why did Seanan McGuire choose to do this? Why? Whyyy?
Another thing: when I started reading this, I didn't know the story had initially been written as a series of episodes, but the fact became painfully obvious when we got an exposition in the first chapter, then a similar exposition in the second chapter, and so on. I think a good round of editing to remove the plethora of expositions would have helped a lot.
While the first chapters were mostly consistent and quite clever at times, the latter half of the book didn't add up. I was perplexed by the explanation that Snow White was actually the old myth of making a sacrifice so winter goes away - is this, like, some widely-known theory or something? If it is, why didn't I know it? If it isn't, why isn't it better explained? What's the connection, aside from dying and winter?
Rose Red is also brought into the story, which feels awkward, since she's actually transgender, and that's... well... everything about her. Him. Whatever. Rose Red was born a girl, found his gender identity as a guy, managed to put his story on hold by not being girly enough to be a princess, then proceeded to not be a part of this plot in any way, shape or form. RR was abandoned before you can say "Rose Red is only here to include transgender people".
Readable, entertaining and memorable, but also more annoying than other books I've read lately.