A Fighting Chance — William C. Dietz

Earth has fallen. And the men, women, and cyborgs of the Confederacy must dig deep within their warrior hearts to make one final stand against an alien aggressor...

On a rim world, Captain Antonio Santana is reunited with diplomat Christine Vanderveen to protect the severely wounded Ramanthian Queen, who has fled there to avoid assassination. And they'll risk everything to save the Confederacy, billions of lives-and their future together.