In October 1957, a fire broke out inside one of the two graphite reactors at Windscale, on England's Cumbrian coast, releasing radioactive contamination across the surrounding countryside. This film reconstructs the accident through archival footage, contemporary news reports, and interviews, tracing how the reactor was built and run under pressure from Britain's rush to produce plutonium for its own atomic bomb. It follows the operators who first noticed the readings going wrong, the decision to douse the burning core with water despite the risk of explosion, and the government's efforts afterward to downplay the scale of the contamination. Milk from local farms was destroyed for weeks after the fire, and the official inquiry's findings were kept restricted for decades. The film sets Windscale against Chernobyl and Fukushima as one of the worst nuclear accidents on record, and asks why an event that shaped British nuclear policy for a generation remains largely unknown outside specialist circles.