The Imperial War Museum in London holds thousands of objects from Britain's wartime past, and this film follows the conservators, curators, and technicians who keep them intact. Cameras go behind the galleries to watch staff clean a Spitfire fuselage, stabilize decaying uniforms, and catalogue weapons and personal effects donated by veterans' families, each object treated as evidence of a specific person's war rather than a display piece. Specialists explain the slow, unglamorous work of conservation, from humidity control to the chemistry of metal corrosion, and how a single artefact, a letter, a medal, a piece of shrapnel, gets traced back to the soldier or civilian who owned it. The film moves through storage rooms not open to the public as well as the main exhibition floors, letting the museum's staff describe why an institution built after the First World War still matters for understanding the Second. The result is a practical look at how a national collection actually survives, told through the people who do the maintaining rather than the history itself.