Worlds of motion and mystery....Behind the Walls of Terra lay a secret no man could be allowed to learn. But Kickaha-the Earthborn adventurer of the tiered worlds-had to uncover that secret, or watch his home world destroyed. And his stupendous adventure took him into the eery Lavalite World where mountains rise from plains or sink into rifts and new oceans form as vast hollows collapse and seas rush in. There is only one escape from this bizarre planet: the gateway to other universes in the palace of the Lord Urthona. Kickaha must reach it if he is to survive, and he must do so despite the terrifying Lords Urthona and Red Orc, the hired thug McKay, flesh-eating vegetation on the run, strange beasts of prey and planetary pseudopods...

Includes Behind the Walls of Terra, the Lavalite World, More Than Fire.