1972. Tasmania. A small introverted island community is emotionally divided between the goal of industrial progress and the vision of a pristine environment. A unique environmental wonder, the alpine Lake Pedder is on the verge of destruction by the largest hydro-electric power scheme in the southern hemisphere. Brenda Hean - one of the leaders of the first environmental political party in the world - and her pilot, Max Price, are flying in an ageing Tiger Moth to petition the Australian Prime Minister in Canberra in a last ditch effort to save the Lake. The plane disappears without trace. The battle for Lake Pedder is lost. The plane is never found.