Mia befriends the Migoo, creatures who are custodians of a strange tree in a large forest. When their habitat is threatened by developers then they too may not survive. On a large construction site, in the middle of a vast and beautiful forest, a man is trapped in an underground tunnel. His daughter Mia, a determined and good natured girl, leaves home to travel the long distance required to find him. At the same time, the ruthless industrialist in charge of the project travels with his son to clinch the deal that is going to make him millions. Mia meets a number of creatures called the Migou. They are custodians of a special tree that resides in a part of the forest and if it should ever be threatened then their lives will be endangered too.