On the planet Pern, where a quasi-medieval society clings to ancient traditions, a deadly threat looms, one that many have forgotten. For centuries, the skies have been clear, free from the silvery, voracious spores known as Thread, which rain down from the Red Star to devour all organic life. The magnificent, fire-breathing dragons and their telepathically bonded riders, once Pern's shield, have dwindled in number, their Weyrs mostly abandoned, and their purpose questioned by the cynical Holding Lords.
In the desolate Ruatha Hold, a young woman named Lessa endures a life of servitude, disguised as a drudge. She is the last survivor of the noble family murdered by the tyrannical Lord Fax, and for ten long years, she has nursed a quiet, burning hatred, subtly undermining her oppressor with her uncanny intelligence and latent psychic abilities. Her spirit, though cloaked in rags and grime, remains fiercely independent.
Her life of quiet vengeance shatters with the arrival of F'lar, a bronze dragonrider from the last active Weyr, Benden. He has come on a desperate "Weyr Search," seeking a woman with the rare telepathic strength to Impression the last golden queen dragon, soon to hatch. F'lar senses Lessa's hidden power, and after a swift, brutal confrontation where Fax meets his end, Lessa is swept away from her ancestral home to the ancient, cavernous Weyr.
At Benden Weyr, Lessa is thrust into a world of immense, living dragons and their proud riders. During the Hatching, in a moment of profound connection, she Impressions the newly hatched queen, Ramoth, forming an unbreakable, telepathic bond. With this bond, Lessa becomes Weyrwoman, a position of immense responsibility and power, yet she is raw, untamed, and often at odds with the Weyr's established order. As Ramoth grows with astonishing speed, Lessa begins to grasp the true, terrifying history of Thread and the monumental task that lies before them.
The bond between Lessa and Ramoth deepens, and Lessa discovers an extraordinary, almost forgotten ability: dragons can travel not only across space, appearing and disappearing in the blink of an eye, but also through time itself. This revelation comes as the signs of Thread's imminent return grow undeniable, and the stark reality of their insufficient numbers - only one active Weyr - threatens Pern's very existence.
The Weyrleader, F'lar, a man of staunch tradition and unwavering belief in the ancient threat, recognizes the desperate need for more dragons. He and Lessa begin to experiment with time travel, sending a new queen and her rider ten turns into the past to allow for breeding and growth. Yet, even this seems a small gesture against the overwhelming force of the coming Threadfall.
As the first Threads begin to fall, a terrifying reminder of Pern's ancient enemy, Lessa makes a daring, almost unthinkable decision. With Ramoth, she undertakes a perilous jump, not just days or years, but four hundred years into the past, to the height of the Dragonriders' power. There, she convinces five Weyrs, teeming with dragons and riders, to join her in a desperate journey forward through time, to Pern's present, to face the renewed onslaught.
The return of the ancient Weyrs, a spectacle of hundreds of dragons appearing in the present sky, heralds a new era. The sheer number of dragons and riders, brought forth from a bygone age, offers a fighting chance against the Thread. The skies fill with the roar of dragons and the flash of fire, as the combined forces of past and present unite to defend Pern from the consuming silver horror, marking the true beginning of the long-forgotten war.
