Britain's wartime industrial machine gets its due in this look at the factories behind the Avro Lancaster bomber, one of the aircraft that carried the RAF's night bombing campaign against Germany. The film centers on the vast assembly plant built to produce the Lancaster, described as one of the largest buildings in Europe at the time, and traces how raw materials, engineering drawings, and thousands of workers were organized to turn out a heavy bomber at a wartime pace. Archival footage of production lines, riveters, and finished aircraft rolling out for testing sits alongside expert commentary explaining why the Lancaster's design and manufacturing process mattered to the broader air war. The documentary treats the factory itself as a weapon of sorts, arguing that Britain's capacity to mass-produce a reliable four-engine bomber shaped the RAF's strategy as much as any pilot or tactic did. It is as much a story about logistics and labor as it is about flight.