Retribution — Toni V. Sweeney

Arcanis is in civil war. The margravine has been deposed. A plague rages.
Sent by TerraFormation with vaccine to help the war-torn planet survive, Miles Sheffield is reunited with his best friend and his niece, offering them refuge on Terra.
When Pallas and the other women on the FSS Clara Barton are abducted, Aric, Miles, and the crew begin a search taking them beyond the Emeraunt Galaxy to the law-forsaken depths of the Fringes.
There, Aric finds an old enemy he never again expected to see. In a fight to the death for possession of his own wife, he'll make a decision affecting not only the Throne of Arcanis but the eventual fate of his own family.