Young Fiona, rider of the gold queen dragon Talenth, has returned from spending three years in the past, where she helped sick and injured dragons and riders to heal in order to return to the present to fight Thread. She is three years older and wiser, but all around her dragons are falling ill and dying, and she and the others are still no closer to uncovering a cure.
Brilliance Audio on compact disc
McCaffrey, Anne. Dragonriders of Pern (Brilliance Audio (Firm))
Pern (Imaginary place) -- Fiction.