The War that Saved My Life, by Kimberly Brubaker Bradley. It's middle grade, and really good. My 10YO and I each picked it up just to look at, and ended up reading it straight through. It's about some kids who go away to the country during the London blitz, only the MC, Ada, has to actually run away to do it because she has a club foot and her mother is very abusive and doesn't want to even send her. A lady who doesn't know anything about children and is a bit of a misfit herself gets Ada and her brother Jamie assigned to her, and it's a lovely story of how she peels back the damage and helps these kids have a normal life. I thought the author was particularly gifted at giving us Ada's very ignorant-of-life POV, while at the same time showing the reader what's really going on.
The Paper Magician, Charlie N. Holmberg. It reads like YA, although the characters are slightly older, but it's in that fantasy setting where there's quite a sliding scale of ages it appeals to. It's England around the early 20th century, plus magic. A girl graduates and wants to be a metal magician, but there's a shortage of Folders (paper magicians), so she gets apprenticed to one of those, instead. And once you bond to your material, there's no going back--you can't change. There's mystery and chases with villains, and it's a series.
Crown Duel, Sherwood Smith. Which I have totally read before, but sometimes you need a book "friend." It's another "civilization of the feral child" story, set in a fantasy world.