Dr Andrew Cook, inventor of a process for making living replicas of human beings, has unwittingly duplicated himself and becomes a secret weapon in the Solar System's struggle for economic survival against a powerful alien culture, the Sentients.
Marius Goring
Wattari
Paul Daneman
Dr. Andrew Cook
John Hollis
Czesni
John Gabriel
Easterbrook
Cyril Shaps
Dr. Duval
John Wood
Brenner