"The Ballad of Songbirds and Snakes" by Suzanne Collins

Most of this book many characters are morally gray. Which I think people like to ignore, but aren't situations more often gray than black and white? And then when people chose to do good sometimes their motive is inherently selfish, so then are they good or are they really bad? It also focuses much on the topic that it's NOT ok when a society is not allowed to question the belief system. We do not grow if we do not learn and we do not learn if we do not ask questions.
Alas, this story gives you a hope you know will not come true. You see hints of Snow's goodness, and you root for him to be. But we all know the end of that story. And when it was evident that he was cold, it still broke my heart.