An Unkindness of Ghosts is so good that it seems implausible that it is Rivers Solomon's debut novel. I mean, I'm very much into generational starships as a literary setting, but this is the best usage of the genre I've encountered so far (it nearly reached a five-star rating for me). We find ourselves on a generational starship, over 200 years into the journey away from a dead planet Earth. People are organized by deck, with the upper decks being the ruling class with a Sovereign, and the lower decks being the ill-treated worker class under guard. But instead of being as simplistic and YA-y as this sounds, An Unkindness of Ghosts goes deeper.