In the aftermath of the Progenitors' defeat, the Grodan Confederation's remaining citizens are returned to the Sagittarius arm to establish a new colony and begin anew. However, Zoe Fenning has managed to escape justice by transferring her consciousness into the body of Beatrice Wu and joining the Progenitors in their exodus. The Empire sends a Guardian, a humaniform AI like Hailey and Molly, to infiltrate the new Progenitor colony on Neron and keep watch over Zoe.