You can really read this book at any age and appreciate it on different levels every time. On one level this is a mystical tale about a Norwegian boy and his father driving across Europe to find the boy's mother who left his father several years/months (time isn't exactly linear in this novel).
Along the way, the boy is given a tiny little book hidden in a sticky bun and then a magnifying glass with which to read the book. In the book unfolds a fantastical tale about life of an island.
Much more entertaining than Sophie's World or Maya, this is essentially a clever children's book which is thought provoking, intelligently written and imaginative