Richard Bonaventure, a scientific explorer, is lost in the South American jungle and becomes trapped in an unknown crater where he makes a fantastic discovery. His family, back in London, have no idea of his fate and, to make matters worse, his eleven-year-old daughter, Lucy, has a serious road accident. As she recovers from surgery she finds that she can now speak to animals and is astonished to learn that she is the Promised One - someone the animals have been expecting for countless generations and who will correct the harm done to them by mankind since the dawn of history. Lucy gradually comes to realize that in fulfilling her mission to help the animals she is also destined to save the human race and the entire planet.