The Lost Fleet universe really expands in this book. With the first six books taking place between Human settled worlds and Human factions and only hints of alien inhabitants, Campbell really makes good on it here, as we explore regions beyond Syndicate space and discover just what else is out there. Unfortunately (or fortunately if you're a fan of this) the story still has a linear feel due to the sole viewpoint, and an obvious military theme to it all, as we remain with Admiral Geary aboard his flagship Dauntless.
The narrator has definitely gotten comfortable with these characters now and reads them like a pro. Also the number of side plots and characters continues to slowly grow, making the universe feel ever larger with each successive novel.
For all the wait between books, however, this one feels way too short! We're definitely left hanging with what feels like a long way to go, making me wonder if the Lost Fleet series will also end up being six books or more. One thing that comes along with the new aliens and growing number of side plots is that there is now much more room for Campbell to spread out and explore much more of this universe. An Author's Note at the end of the hardback version mentions that Campbell is planning to write a side novel set on the Syndicate worlds next, so it sounds like that expansion is definitely going to happen.
One departure from some of the previous novels is that there is a lot more humor injected into this one. Unfortunately it doesn't all stick. I was confounded when the "universal sticking substance" the aliens wanted turned out to be duct tape! It just felt too... childish. Also some of the phrases used between the characters, especially Geary and his wife, felt too much like modern slang to me, and I felt that they crept in there by the author as he, knowingly or not, keeps up with the "lingo" of the day. I hate when authors do that.
Part of the reason for such a good review is that I have become a fan of the series and can forgive some weaknesses in the writing style and such. But Campbell has definitely improved since the beginning. These characters feel like old friends, even though at times it is annoying that they still go through some of the same arguments and attitudes they've always had with each other.
Overall Campbell may not be a literary genius and his work may not blow you away and change your perceptions of the world, but nevertheless this is clean, intelligent military sci fi with an engaging story, and a great read for entertainment purposes.