In an attempt to foster better relations with Sirius, Klorathy, a senior Canopean Colonial administrator, invites Ambien II to observe events in their territory. Ambien II, eager to learn more about Canopus, agrees. As Rohanda evolves and civilisations come and go, Ambien II and Klorathy meet several times to watch Rohanda's degeneration. Canopus does what it can to help communities, but with Shammat's evil and a broken Lock, they make little progress. From time to time Klorathy requests Ambien II's help and while working on the planet, she meets Nasar, another Canopean official. She also encounters Tafta, the Shammat commander on Rohanda, and at one point nearly succumbs to his corruption.