Rosie lives with her extended family and friends in the Zambezi valley. When the evil Mr Umani and his men decide to take the valley for themselves they commit a terrible act which leaves Rosie alone. Sam has grown up in England but is returning to Africa with a new name to live with his grandfather, a special holy man who has magical connections to the plants and animals around him. The very spirit of nature lives in the valley and makes its presence known to Rosie, imbuing her with magical powers. When the evil Mr Umani arrives to take charge of 'his' valley, little does he realise that the schemes of man are as nothing beside the power of nature's goodness. Between them Sam, his grandfather, and Rosie and her friends must teach him a lesson which they hope will change his bloodthirsty ways.