A Harvest In The Clouds

A Harvest In The Clouds oversees a species of Druid like people, whose technology hasn't advanced past clothes made of grass. They live on an island floating high above an archaic Earth where a coming-of-age festival takes place annually and from which no-one returns. The main character, Iehan, is preparing to take part in the Festival. He suspects that those who partake in the Festival are lowered to the Utopia below. But is that really true?