Dragonsblood : Dragonriders of Pern ; bk. 18
(Book)

"A Del Rey book"--T.p. verso.

The story alternates between two times--the immediate present, more than 500 turns since the first landing on Pern, and 400 turns earlier, when geneticist Wind Blossom, whose mother had created the dragons, was still alive. The situation in the later period is dire: thread is falling, and the dragons are sickening and dying. Only Wind Blossom can save the dragons, and that seems impossible. Time is the literal cure, however, and making the impossible possible is the bond that Lorana, a marvelous young woman of the present, makes with Wind Blossom by reaching back in time to come up with the cure.