Shards of Honor — Lois McMaster Bujold

IT WAS THE WRONG WAR...

In the wrong place, at the wrong time, for the wrong reasons. She even wore the wrong uniform; Cordelia Naismith, Betan Expeditionary Force, had been hurried into battle still wearing her old tan Astronomical Survey fatigues.

Now, captain of a throwaway ship on a mission of deception, she convoys a weapon of wicked subtlety to entrap and destroy an enemy armada.

But Cordelia will discover deception within deception, treachery within treachery, until finally she is forced into a separate peace with her chief opponent, Lord Vorkosigan. It is a peace that earns her only ignominy--even though it foreshadows a new beginning, for herself, her lover, and both their peoples.