Pern Novels [chronological order]

When the first humans came to settle the planet Pern, they did not come alone: intelligence-enhanced dolphins also crossed the stars to colonize Pern's oceans while their human partners settled the vast continents. But then disaster struck. The deadly silver spores called Thread fell like rain from the sky, and as human colonists' dreams of a new, idyllic life shattered into a desperate struggle for survival, the dolphins were forgotten.

The last time Thread attacked Pern, the world was unprepared for the fight - until the Oldtimers appeared. These courageous dragonriders arrived from the past, traveling 400 years to help their descendants survive. But the collision of past and present took its toll. While most of the displaced rescuers adapted to their new reality, others could not abide the jarring change and found themselves in soul-crushing exile, where unhappiness and resentment seethed.