When Tasmania’s Hydro-Electric Commission planned to build a dam on the Franklin River, Launceston’s Wilderness Society mobilised to protect it, sparking a now-infamous, and ultimately victorious, campaign of blockades, protests, lawsuits and political wrangling – a campaign that was a key part of the development of the Australian Greens movement. Franklin recounts this seminal environmental protest through the eyes of Oliver Cassidy, who retraces the journey on the World Heritage–listed river taken some 40 years before by his late activist father.