Settling the new planet, adjusting to its differences, the colonists spread out across the southern, most hospitable continent. Then disaster struck in the form of a rain ofmycorrhizoid organisms, which voraciously devoured all but stone,metal, and water. The initial losses were staggering. But fortunately for the young colony, "Thread," as the settlers called the devastating showers, was not entirely invincible: both water and fire would destroy the menace on contact.

...

It is a time of hope and regret, of endings and beginnings. The Red Star, that celestial curse whose eccentric orbit was responsible for Thread, has been shifted to a harmless orbit, and the current Threadfall will be the last. Technological marvels are changing the face of life on Pern. And the dragonriders, led by F'lessan, son of F'lar and Lessa and rider of bronze Golanth, and Tia, rider of green Zaranth, must forge a new place for themselves in a world that may no longer need them.

But change is not easy for everyone. There are those who will stop at nothing to keep Pern and its people pure. And now a brand-new danger looms from the skies and threatens a catastrophe of unimaginable proportions. Once again, the world looks to the dragons and their riders to save the world. But now, as the friendship of F'lessan and Tia begins to bloom into something more, unforeseen tragedy strikes: a tragedy destined to forever change the future--not just of the two young lovers, but of every human and dragon on Pern...