All the Weyrs of Pern

About “All the Weyrs of Pern”

A 1991 novel by Anne McCaffrey. Dragonriders have long dedicated their lives to fighting Thread, deadly spores that periodically rain from the sky, flaming it out of the air on their telepathic dragons. Led by Masterharper Robinton and Weyrleader F'lar and Weyrwoman Lessa of Benden Weyr, the people of Pern excavate the planet's ancient original settlement and uncover a still-functioning voice-activated artificial intelligence system that offers a good chance to annihilate Thread once and for all.