Scouts (Commonwealth Universe: Age 3, #11)

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...

Bain and the first generation of Scouts go on a training flight with the first Scout ship, but it turns into their first official rescue mission. Sunsinger has been damaged, Ganfer could be destroyed...and Lin is missing.