This book is classic Scalzi! On the one hand, a darn good story - one that kept me reading, even when I had other things I should have been doing. But that is never all there is to a Scalzi story. He pulls you into his characters' lives, and gives them (and you) things to think about. The world in a Scalzi novel is never as simple as it seems. I know there are people who don't like that. For me, though, that kind of thing is like brain candy! The Old Man's War series has been going on for quite a while, and the history of all that happened in the earlier books plays into this story. By now, I knew most of these characters, and liked most of them, too. They've had a really hard time so far, and this book does not let up on them at all. The ending is hopeful, all though a lot remains to be resolved. I would call this a very good read.