Kady and Ezra broke up, then their planet was invaded. The former couple escapes the planet but their problems aren't over yet. Three ships filled with refugees are trying to get across the universe to the next bit of civilization while being chased by their invaders. Disease, resource limitations, and a potientially crazy AI are all threatening their ability to survive.
This book is an epistolary novel, so if that isn't your jam I'd pass on this book but if you like Sci-fi and epistolary novels pick this book up because it's really solid. It also immediately made it on my list of book to buy a physical copy of. Have you seen the dust jacket and cover? It's amazing and a quick flip though the book shows you how beautiful the art in this book is. There are some clunky bits of this story but they didn't impact my enjoyment of the story or the way that it was told. I can't wait for the next book(which is apparently both a sequel and also a companion novel) and I'd obviously recommend this book.
Okay now on to some if you've read the book stuff.(show spoiler)