This is the final book in the excellent Conqueror's Trilogy.
The first book told the story of an attack on humans by an alien race.
The second book (in my opinion, the best of the 3), told the story from the aliens point of view.
This final book switches between both the viewpoints, and brings both the books together for a superb finale.
The excellent writing and imagination of Zahn has created his usual page turner, keeping you desperate to read throughout. He also does an amazing job showing the aliens way of life.
In summary, get a hold of all 3 books, and read them - you won't regret it.