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 will come back for them, and they will all go to Bluestone together.

Though Bluestone sounds like a wonderful place, the boys find it difficult to wait for the captain on Terrene. The island is so gray that it is hard for them to imagine the vibrant colors of Bluestone. Soon they grow tired of watching and waiting for their captain, and it is hard for them to remember his voice. Can they really believe that he will come back for them? To do so they must have faith-they must see with their hearts, not their eyes.

Will the captain really come back for Arion and Argo like he promised? And will the boys be ready for his return?