From ROI Wiki

The Homecoming series is a sequel to The Offworld Chronicles and picks up the story of Simon Williams, and his many other friends and associates shortly after their return to Earth at the end of the original series, including their readjustment to life back home, and all of the things that have changed because of their time on Offworld, as well as several pivotal, major events that occur as a result of their time there. This is planned as a 3 book trilogy, but the exact length is unknown at this time.