The Purple Plague — Susan Page Davis

Everyone in the castle is sick, and their feet are turning purple. The king's evil brother chooses this time to take over the kingdom. Alaric, the cook's helper, is the only one who doesn't have the Purple Plague, and he wants to help the king. But the king is in the dungeon, and Alaric's too short to reach the key! This fairy tale for all ages makes a wonderful read-aloud for grandparents or parents with their favorite children.