The author of the bestselling Riverworld saga presents the second omnibus volume of classic SF novels from his popular World of Tiers series. These three action

The first three adventures set in the amazing realm created by the Hugo Award–winning author of Riverworld and “an excellent science fiction writer” (Isaa

Wolff-Jadawin, demigod in Earthman's guise, and Lord of the Planet of Many Levels, opened his eyes to see the symbol of the Master Lord, Urizen, floating below

Robert Wolff finds a horn that has the power to open a door through space-time to a universe of tiers that are made up of ascending worlds. At the top is the be