When Miriam Beckstein discovered she was a lost daughter of a family of universe-jumping medieval merchants who were making tons of money in illegal and semi-legal operations in the US, she was an outsider... but their situation was pretty secure, in both of the worlds they operated in. Now, she's well-regarded with at least one faction of the family, but everything else is going to hell... in one world, the royal family has turned against them, and meanwhile, in the world she grew up in, the United States is starting to develop their own universe-jumping technology... and they're prepared to strike back at their perceived enemy. She has to deal with mounting crises, including a faction of the family trying to seize power and strike the United States directly and a third world that's undergoing a revolution of its own, to save who she can and, ideally, herself.
This is the fifth and sixth book of an ongoing series, and in a sense a conclusion (although there is another book, it takes place many years later). When you get this far in a series, it usually's taken as pretty obvious that you enjoy it. However, my journey through this particular series has always been mixed, and this volume isn't an exception to that. There's stuff I really enjoy, and and there are things I'm not as into, and all the scheming and concurrent plotlines do make it a complicated book to follow. Sometimes I feel that complication comes at the expense of character development... things just move so quickly that the interactions feel lighter and a lot of characters are already too similar in how they interact. I know and liked most of the main cast (though it doesn't help that some of them have multiple names depending on who they're interacting with), but many of the side characters blur together.
What I do really like is the plot itself, though, complications and all. Sure, some of the scheming and counter-scheming sometimes wears on me (or loses me), but when you break down the events at a simpler level, things keep happening where I really want to see what happens next. In particular, although most of this series is the type of story where you can pretend it's actually happening in "our world", and just most people don't know what's "really" going on... this book gets to do something I love and rarely get to see, showing it actually diverging significantly. Too many books and TV shows of this model keep having it be a secret (even when it starts getting to be ridiculous) and matching our world in all the politics I just love to see, for example, a decidedly different president coming to power. It doesn't give me enough of that to completely satisfy, but that just means I probably will dip into the next book in the series.
Speaking of, as a conclusion... it only kind of works, which I suppose is fair because it's only kind of a conclusion. As I said, another book is out. Still, the book jumps ahead in time, and I feel like if you treat this as an ending, you get subplots and characters that just feel like they get no wrap-up at all, and others that resolve too quickly, and if you don't treat it as an ending then you get subplots and characters that will inevitably have to be wrapped up off-page between books, with, at best, a summary after the fact.
I loved the hints at the scientific exploration of the universe-crossing ability, and again wasn't too into the medieval scheming and reproductive politics (though even that became interesting at times), but on the whole I liked the book and want to continue in the world.