Johannesburg sits on top of roughly 600 abandoned gold mines, and their waste dumps now double as backyards for entire communities. Journalist Martin Boudot and his team walk those dumps with a Geiger counter, tracking radiation levels next to homes, schools, and rivers, and the readings spike wherever the wind kicks up dust from the mine tailings. Interviews with residents describe illnesses they link to the contamination, while scientists and mining officials give conflicting accounts of how dangerous the exposure actually is and who bears responsibility for cleaning it up decades after the mines shut down. The film traces the contamination into the water supply, where acid mine drainage has turned some streams orange and pushed uranium into soil used for farming. Boudot's investigation moves between government offices, mining company representatives, and the informal settlements built closest to the waste, building a picture of a city that made its fortune from gold and is still paying for it in radioactive dust.