Andromeda's War — William C. Dietz

In Andromeda's War, his heroine will face her ultimate test -- as a battle-scarred legionnaire and as an innocent young woman who once lost everything…

Now a platoon leader, Legionnaire Andromeda McKee seems to have successfully left behind her true identity of Lady Catherine “Cat” Carletto, one of the last two surviving members of the Carletto family targeted for death by Empress Ophelia.

After failing at her one shot at vengeance, Andromeda had been questioning her own resolve. But now her uncle has been killed in a government raid back on Earth, leaving her as the last Carletto standing -- and the family's only chance for justice…

A chance that comes when the empress's ship crashes on a hostile planet and Andromeda is assigned to head up the rescue mission. As a legionnaire, Andromeda McKee has countless kills under her belt. But when faced with her greatest enemy, it will be Cat Carletto who has to pull the trigger on the one who really matters…