Ambien II, one of the Five who run the Sirian Colonial Service and also govern the Sirian Empire, represents Sirius on Rohanda. She sets in motion a series of bio-sociological and genetic experiments where large numbers of primitive indigenous people from Sirian colonised planets are space-lifted to Rohanda and adapted there for work elsewhere in the Empire. In the north, Canopus nurtures Rohanda's bourgeoning humanoids and accelerates their evolution. They also put a Lock on the planet that links it to the harmony and strength of the Canopean Empire. Canopus keeps Ambien II updated with reports of all their work, but she is suspicious of Sirius's former enemy, seeing them as a competitor rather than a partner, and is unable to correctly interpret them.