This is the third book about Perry (after Old Man's War and The Ghost Brigades). It finishes off his story in great style - I think it's the best novel of the three. There's little of the humour of the first novel left, as Perry is given governorship of a new colony world and finds himself in a huge pile of trouble (hostile wildlife, human politics, interstellar war, etc).
The only thing that really troubled me is that a major subplot on the colony world is dropped as soon as the bigger picture issues come into play. I realise that the characters might be preoccupied, but there's a point where several months are skipped and I was expecting that how things played out would at least be mentioned. Oh well, a minor point really.
Read this. After you read the first two.