The star of this original book is a line. A simple pencil line that one day got bored with the pages of an exercise book and decided to escape from class. Happily off she goes to explore the world, and on her travels she discovers a city, climbs the highest mountains and finds the sea, where she comes across some very scary pirates. Suddenly the reader realises that the real star of the story is a boy called Leonardo, who lets his imagination wander in class, and goes off on adventures while his classmates are doing their handwriting practice.