Secret Agent of Terra is a 1962 science fiction novel by British writer John Brunner. It is the first book of the Zarathustra Refugee Planets series; the other books are Castaways' World (1963) and The Repairmen of Cyclops (1965). Secret Agent of Terra was first published as Ace Double F-133, with The Rim of Space by A. Bertram Chandler. Brunner later reworked the story for his 1969 novel The Avengers of Carrig. Source: Wikipedia (en)