In one volume, here are the last three novels in the classic SF adventure series, The World of Tiers: Behind the Walls of Terra, The Lavalite World, and More Than Fire. These are the great originals of universe-hopping adventure that later writers, including Roger Zelazny in his Amber Series, used as models. Zelazny himself says, "I admire his sense of humor and facility for selecting the perfect final sentence for everything he writes. He can be stark, dark, smoky, bright, and any color of the emotional spectrum...put quite simply, he arouses awe," The tierworld books...