This book is the second in The Change series. If you haven't heard of this series before, it's post-apocalyptic YA. Several generations after civilization collapsed, humanity has recovered enough to rebuild towns and some sort of economy, but separate towns tend to go to war with one another. Genetic mutations turn up frequently but unpredictably, giving some people superpowers and killing or injuring others. The world is incredibly diverse, with main characters of multiple races, sexualities, disabilities, and neurodiversity.
So on to Hostage! The people of Las Anclas are still dealing with the repercussions of the big final battle of Stranger (book #1), particularly PTSD and grief. Jennie, Ross, and Paco have been hit especially hard, causing damage their relationships with family, friends, and romantic partners. This all takes a turn for the worse when, on a trip outside the town walls, Ross is kidnapped by Voske's soldiers. Having learned about Ross's Change power and wanting its benefits for himself, Voske is determined to Stockholm Syndrome, manipulate, or outright force Ross into working for him. A team of Las Anclas people attempt to come to Ross's rescue, but when that seems impossible, they resort to kidnapping Kerry, Voske's daughter and the Crown Princess of the Gold Point Empire.
OH MY GOD YOU GUYS THIS WAS SO GOOD. I loved the setup of dueling hostages, and it provided a really interesting opportunity for the characters to deal with genuine moral questions: how to treat prisoners, how to gain power, how to deal with political differences, the responsibility of choices made during combat, the ethics of execution, freedom vs constraint, and so on. There's a lot of very tense, very well-done action scenes, and the suspense ramps up excellently over the novel as a whole.
I loved this even more than the first book, which was already pretty great. But this one was even more of a page-turner, and I read it straight through, always wanting to find out what happened next. I did miss Felicite, who appears in the story but isn't a POV character this time, but on the other hand, Kerry's a wonderful introduction, and I loved her slow growth from arrogant and coddled heir to someone with responsibility and honor, as she struggles to figure out what she wants out of life.
Anyway, everyone should read this, it's fantastic.