Mission of Honor
(from inside dust jacket)
COLLISION COURSE
The Star Kingdom of Manticore and the Republic of Haven have been enemies for Honor Harrington's entire life, and she has has paid a price for the victories she has achieved in that conflict. And now the unstoppable juggernaut of the mighty Solarian League is on a collision course with Manticore. The millions who have already died may have only been a foretaste of the _billions_ of casualties just over the horizon, and Honor sees it coming.

She's prepared to do anything, _risk_ anything, to stop it, and she has a plan that may finally bring an end to the conflict to the Havenite Wars and give even the Solarian League pause. But there are things not even Honor knows about. There are forces in play, hidden enemies in motion, all converging on the Star Kingdom of Manticore to crush the very life out of it, and Honor's worse nightmares fall short of the oncoming reality. 

But Manticore's enemies may not have thought of everything after all. Because if everything Honor Harrington loves is going down to destruction, it won't be going alone.
Fiction, Women soldiers, Honor Harrington (Fictitious character), Space warfare, nyt:hardcover-fiction=2010-07-11
David Weber