In this science fiction novel set on the planet Pern, humanity faces the ongoing threat of Thread, a deadly organism that rains down from the skies, destroying all organic matter it touches. The inhabitants of Pern, including the dragonriders who traditionally protect the land, discover an ancient artificial intelligence that offers a chance to permanently eliminate the Thread menace. As they work to understand and activate this ancient technology, they must overcome internal political struggles and the skepticism of their peers to unite the planet's disparate communities and weyrs (dragon lairs) in a monumental effort to save their world from the relentless destruction of Thread and usher in a new era of peace and prosperity for Pern.

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