"A Del Rey book"--T.p. verso.

With the discovery of Aivas, the artificial intelligence hidden for centuries in Pern's southern continent, the residents of the third planet of the sun called Rukbat have learned how to end the threat posed by the periodic fall of Thread from the erratic red star that orbits the planet. Despite the abundance of rediscovered knowledge, new dangers and old fears surface, forcing Dragonriders, Holders, and Craftmasters all to reconsider their purpose and functions in society.