Twin brothers Arion and Argo are scared. They have spent most of their lives shipwrecked on the lonely, gray island of Terrene with their ship's captain, and now he is leaving and they cannot imagine life on Terrene without him. He is going to Bluestone, a place where the birds always sing and the grass is ever green. He tells them he is going to prepare a place for them in Bluestone. Then he w…