Cetaganda - Lois McMaster Bujold

The invasion force I mentioned in the last review come from the Cetagandan Empire, a society with extreme division between the different classes. Even though it was not that long since Miles was defending his life against these people, he finds himself struggling to help their people.
Never sure who is truly a comrade, and who has daggers for his back, he muddles through and eventually receives a surprising reward.