This is book number 3 in the Liaden Universe Space Regencies series.
Aelliana Caylon has escaped her abusive family. She's found love in her starship co-pilot--a man who turns out to be the leader of Korval, the most powerful clan of the Liaden Universe. But destiny never intended an easy life for Aelliana. Insidious forces within the empire are determined that a new line of Korval heirs be destroyed and that Clan Korval itself be blasted to interplanetary dust. The fight for the future of the Liaden Universe is on, and one heroine is determined to protect her family and her soul mate at all costs