Iceland sits on a rift where two tectonic plates pull apart directly over a deep-mantle hotspot, and that collision has built an island of roughly 30 active volcanoes. The film centers on the 2010 eruption of Eyjafjallajökull, whose ash cloud grounded flights across Europe and turned an obscure Icelandic glacier into a household name. Volcanologists and local farmers describe living alongside four other systems considered overdue for eruption, Hekla, Katla, Askja, and Grímsvötn, and explain what history and seismic monitoring suggest about each one's habits. Scientists walk through the sensor networks and GPS stations now watching for the ground swelling that precedes an eruption, and the footage moves between lava fields, glacier-capped calderas, and steam vents to show how the landscape itself records this activity. The film treats Iceland less as scenery and more as an active construction site, still being built by the same forces that periodically threaten to disrupt it, with farmers whose land has been reshaped by ash and lava describing what it means to live on top of it.