Once in a generation the Lord of the Locusts and his swarm of hungry insects descend like the plague on the planet Yumi, threatening to destroy the very trees upon which Matthew John and his bat riders depend for their survival, and putting all they hold dear in danger. In this gripping adventure readers discover how wise old Mr. Seeds met this challenge in his youth when he was a bat rider, and learn what they must do if they are to battle the Lord of the Locusts themselves.