About the book: 1993 / Morita, Lady of Fort Weyr, arrives at the first meeting of Lord Alessan, ruler of Ruatha Hold. During this time, a plague-like disease spreads among the inhabitants of Pern. Since both racehorses and people are sick, the healer Kapaim decides that the infection is transmitted from one side to the other. Morita and the other riders organize a special service that delivers a special vaccine throughout Pern to prevent a new outbreak of the disease..