So, Peter. You built a geothermal power station in Tasmania? Done anything like that before? Any problems stand out? God? But you finished it in the end? When Peter Main takes on his brother's legacy project, he expects it will be plain sailing. Protests, politics, cost blowouts and a most unfortunate death are all overcome, but when an evangelical herbalist takes things a bit too far, everyone agrees something's got to be done. While the Tasmanian devils argue noisily in the night, the devil is in the detail. Isolated in the Tasmanian bush, the people at Hot Rocks must rely on their own moral compass - if they have one.