A complex if slightly cliche SF with a great cast of characters.
Conquered by the Jao twenty years ago, the Earth is shackled under alien tyranny - and threatened by the even more dangerous Ekhat, one of whose genocidal extermination fleets is coming to the solar system. The only chance for human survival is in the hands of an unusual pair of allies: a young Jao prince, newly arrived to Terra to assume his duties, and a young human woman brought up amongst the Jao occupiers. But, as their tentative alliance takes shape, they are under pressure from all sides. A cruel Jao viceroy on one side, determined to drown all opposition in blood; a reckless human resistance on the other, which is perfectly prepared to shed it. Added to the mix is the fact that only by adopting some portions of human technology and using human sepoy troops can the haughty Jao hope to defeat the oncoming Ekhat attack - and then only by fighting the battle within the sun itself.
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Source: I purchased this book myself from Audible.
The Course of Empire by Eric Flint & KD Wentworth, read by Chris Patton, published by Audible Studios (2012) / Length: 18 hrs 50 min
This is Book #1 of 2 (so far) in the "Jao" series. The 3rd book, The Span of Empire, has been long delayed due to the death of Ms. Wentworth, but is scheduled to be released on Kindle & hardcover today (9/6/16). I did not receive a response regarding the release date for the audiobook.
There are a lot of cliches present in this book: It takes place in America, which was among those who fought the hardest; our weapons might be superior to theirs & we might be able to help them win a war they've been fighting for centuries; we might have won if only we hadn't been so divided etc. But that doesn't mean it isn't well done. This is my kind of military SF - in that it focuses a lot on the characters, especially people who think, and not just on actions.
One of the things that determines if a book is a "repeater" for me, and thus a recipient of more stars, is whether or not it has memorable moments & scenes that I enjoy revisiting. This book has many such "highlights," making it difficult to limit myself to my usual 3 below.