"They came from out of the black silent sky-two alien beings in search of a specimen of Total Evil. If they failed in their quest they could never return to their own planet but must wander endlessly through space. A terrifying concept from one of sci-fi's most celebrated writers."
"Here is dazzling entertainment-with something extra. Wry humor...smooth writing...ingenious plotting...especialy recommended."
Library Journal
"Here is dazzling entertainment-with something extra. Wry humor...smooth writing...ingenious plotting...especialy recommended."
Library Journal
This title, according to the ISFDB, is a 1979 reprint of the 1967 "The Rule of the Door and Other Fanciful Regulations". An excellent story collection if you don't have the other title.
