Whatever Happened to Brenda Hean? focuses on the unsolved disappearance of the eponymous figure. Hean was an environmental activist who vanished in 1972 while flying to Canberra to campaign against the destruction of Tasmania’s Lake Pedder, which was to be flooded for a hydro-electric scheme. The text is written by documentary film-maker Scott Millwood, who ‘offered a $100,000 reward for information that would lead to an answer to the mystery’.