The story of a yellow lab retriever guide dog for the blind named Quill. We follow Quill from the litter, his selection to become a guide, and his life with a foster family until his first birthday, followed by highly specialized schooling in guiding the sightless. He is paired with a blind man who is at first reluctant to rely on Quill. But Quill's great patience, gentleness, and skill eventually win him over and they become inseparable friends.

A boy and girl face many obstacles while searching for a legendary floating castle.