Do you know Pern, the planet where a tribe of Winged Ones, humans and dragons, inextricably linked, lives? So find out how it all began. For on the day when the colonists landed on the surface of the virgin, generous planet, there were no dragons, but there were vast spaces to be mastered, and labor, and joy from today's successes, and anticipation of tomorrow, which could not be overshadowed by the petty machinations of a few colonists, those who were not resigned to a one-way trip. And no one knew that the peaceful planet would soon be attacked from space. The name of this deadly enemy is Thread!