An expansion of the novella "Thunder Over Starhaven", by Robert Silverberg as by Ivar Jorgenson, Science Fiction Adventures October 1957.
Source · ISFDB CC BY 4.0
Placement
- Robert Silverberg: The Ace Years
- contained in Robert Silverberg: The Ace Years, Part Oneomnibus
- contained in The Chalice of Death: Three Novels of Mystery in Spaceomnibus