Volcanologists around the world are racing to decode the complex, subterranean signals that precede a volcanic eruption. By studying gas emissions, ground deformation, and seismic tremors, these scientists strive to predict when a dormant giant might awaken, potentially saving thousands of lives in the process. From the slopes of Mount Etna to the peaks of Mount St. Helens, this documentary explores the cutting-edge technology and human ingenuity behind the quest to master the unpredictable power of our planet's most dangerous volcanoes.