Hilarity! Well, if you're me, and for very specific reasons. As a book, more of a psychological thriller.

Jared Dirac is a clone created to house the consciousness of escaped traitor, Charles Boutin. When the consciousness doesn't take, Dirac is shuffled off to the Ghost Brigades, to make himself useful as a soldier. Most of the drama comes from Dirac trying to discover what made Boutin a traitor, and if that potential lied within him as well. I tend to like the amnesiac protagonist, so I was fully on board.

Unfortunately, the protagonist was never quite fully real to me, and I'm not quite sure if that's partly because of his manufactured consciousness, or just a personal incompatibility. I didn't quite care what happened to him as much as I should have.

This is the sequel to [book:Old Man's War], and I found it moderately hilarious that Scalzi carefully answers all my objections to the first novel. I'm fairly certain (in the absence of any evidence) that he was carefully addressing the objections of reviewers, and to his credit, he does it fairly well:

Q: Why the song and dance procuring genetic samples? Why not just whip up a million from one sample?
A: A clone army would be extremely vulnerable to viral weapons.

Q: Why do the ghost brigade soldiers all have western first and last names?
A: The Colonial Defence Force is just ethnocentric like that.

Q: Why bother with the regular forces if the Ghost Brigades are such a fearsome fighting force?
A: Because the CDF fears the Ghost Brigade and wants them small enough to be kept in hand.

Q: Why are the soldiers all from the first world, and the colonists from less developed nations?
A: ...I didn't really understand his explanation here, and I've returned the library book, but he did try to address it!