This is the ninth (and final) book in the and "Croyd Spacetime Maneuvres and " series, which Croyd (1967); Dr. Orpheus (1968); Pan Sagittarius (1973); A Voyage to Dari (1974); The World Asunder (1976); Z-Sting (1978); Heller's Leap (1979); The Lucifer Comet (1980); Megalomania (1984). Ian Wallace was the pen name of science fiction author John Wallace Pritchard (1912 - 1998).