Invasion
Dean Koontz
The Ringworld Throne
Larry Niven
Ringworld (3)
Hell's Gate
Illusion
Frank Peretti
Xanth 03 - Castle Roogna
Piers Anthony
Xanth 09 - Golem in the Gears
Apprentice Adept 07 - Phaze Doubt
Xanth 16 - Demons Don't Dream
Xanth 14 - Question Quest
Piers Anthony;Piers A. Jacob