Aramar (Commonwealth Universe 35, Age 3: Volume 9)

Vidan was again reaching out to the stars: sadder and wiser...and cautious, unwilling to repeat the mistakes of the ancestors. The Commonwealth was born, reaching out to lost colonies and establishing new ones, rediscovering lost technology and how to navigate the star-ways. Many of the lost colonies not only survived but thrived--and they remembered their abandonment and the harsh centuries of the Downfall...

A colony world lost during the Downfall, Aramar is in a strategic spot between the Commonwealth and Conclave. Both galactic civilizations want Aramar to join them.

Trouble is brewing. The crew of Sunsinger is asked by the Commonwealth Council to go to Aramar and assist the Commonwealth's ambassadors and, if the trouble erupts into civil war, help them escape.

Lin is friends with the ambassador and his wife, so she and Bain stay at the embassy. They meet the two ruling families of the planet and Bain lands in a position to help when rebellion erupts across the planet. What he does will affect the Commonwealth and Aramar for decades to come.