Little Lucas is a happy boy, artful and loved by all. Among the many children's costumes, one of his favorites is to pretend to be a pirate. One day while hiding in a cave (his father's wardrobe), Lucas finds what appears to be a treasure map. Was it a chance to become a real pirate?
Excited, Lucas asks for help from his neighbor, Bruno, the smartest boy in the class and his best friend. Together, they set out on a journey through the small town where they live for adventures and a well-deserved reward. They don't know yet, but they are about to discover Earth's Greatest Treasure.