Ace Books Copyright 1970. Cover Art by Boris Vallejo.
The fourth book in an extraordinary World OF Tiers Series.
The fourth book in an extraordinary World OF Tiers Series.
Behind the Walls of Terra is the fourth volume in 'The World of the Tiers' quartet. There is a secret no man could be allowed to learn, but Kickaha had to uncover that secret or watch his home world be destroyed.
#4 in World of Tiers series
Book 4 of the World of the Tiers series.