Under the trackless sands of the Sahara lies Zanthodon. That vast subterranean realm is the final homeland of the one-time masters of the world's surface great dinosaurs, mighty jungles and living bands of primitive peoples from Neanderthals to Ancient Minoans and even Barbary pirates. It was into the cruel hands of those feared corsairs that Eric Carstairs' beloved cave-maiden, Darya the Cro-magnon princess, had fallen. It was his mission to save her, as well as to keep his caveman friends and his professor guide from the innumerable dangers spawned in the unmapped wilds of the Underground world.
Volume 4 of Carter's Zanthodon series:
- Journey to the Underground World: The Adventures of Eric Carstairs in Zanthodon. DAW Books, 1979
- Zanthodon: Further adventures in the underground world. DAW Books #391, 1980 188pp ISBN: 0-87997-543-1.
- Hurok of the Stone Age. (Eric Carstairs Adventure) DAW Books #423, 1981
- Darya of the Bronze Age.
- Eric of Zanthodon. DAW Books #483, New York 1982 176pp