Inside Earth — Poul Anderson

In this gripping sci-fi novella from award-winning writer Poul Anderson, the galaxy has been taken over by a regime known as Valgolia, whose brutality and ruthlessness is known far and wide. A man named Conru sacrifices everything to aid the uprising against Valgolia, but when he penetrates the resistance's upper echelons, he finds himself immersed in a complex political game.