"Secret Agent of Terra" is the first book in Brunner's "Zarathustra Refugee Planets" series. The other books are "Castaways' World" (1963) and "The Repairmen of Cyclops" (1965). Brunner later reworked the story for his 1969 novel "The Avengers of Carrig." Chandler's "The Rim of Space" is the first novel in his 'Rim World" series. It was followed by five more titles. The book also features his character "John Grimes."
