In one volume, here are two novels in the classic SF adventure series, The World of Tiers: “Behind the Walls of Terra” and “The Lavalite World”.
The tierworld books are full of non-stop action and typify Farmer's boundless imagination.
Who else would have thought of stacking up pocket universes like a ziggurat or the layers of a cake?
Join Earthlings Robert Wolff and Paul Janus Finnigan (alias Kickaha) on an unforgettable adventure to big for any single world.
