Whilst not reaching the same heights as the previous two books, this is very good read and gives a satisfying end to what could be called "The Grik storyline arc".
Suffice to say all the main elements are present, namely the Americans, loads of Grik, the cats, the boats, the Amagi etc. The main characters are not developed as much as in earlier books, but thats not a particular problem. They are well rounded characters already and in this book are focussed on the task at hand.
Pleasingly, there are also several new story threads seeded throught the book which hint at what may lie beyond the small geographical sphere that the story has been set in.
I also noticed that as the story progresses, the author has carefully compressed a number of skirmishes and encounters between the good guys and bad guys into a few paragraphs, rather than a 40 page chapter. The more routine ship v ship and army v army stuff that has been covered in considerable detail in earlier books is skipped over. More time is spent in certain key battles and incidents that show how the characters are learning and developing tactics, strategies and technology. This is good, keeps the story moving along and avoids the reading getting bored with what could have been fairly repetative content.
One criticism though is that the author is becoming inconsistent with the levels of damage that ships dish out and can absorb. Certain ships appear to be more resistant to damage than others, the author needs to be carefull to not push the envelope on this any further.