We met the Darhel earlier in this series. An alien race that played a huge part in the Posleen War. This story places Tirdal, a Darhel, in a deep reconnaissance team with humans. They are sent on a mission to determine if the new foe has established a beachhead on their target world. The interplay between the humans and their alien teammate provides the tension for the story.
This is not the typical action dominated Ringo story. In that, it was a disappointment. However as a study of interspecies relations it was excellent. An understanding of the Darhel fills some gaps in the background of the Posleen series. The implacable Dagger, a sniper, faces the immutable Tirdal in a contest of wills. Ferret provides the positive human role model that offsets the despicable Dagger. This was an excellent character study that fleshed out parts of the Posleen series. I am sure it is disappointing to the adrenalin junkies who revel in the mad mayhem that often is a hallmark of John Ringo but I liked the book. At the end, you will find yourself wondering, who was the hero?