In the heart of the Australian Outback, a ball of flame marks the crash of a Zeppelin into the rim of the Arltunga caldera where rare threnium is harvested. The disaster grounds the gliders towing nets of Belgian lace through the threnium-laden mists. Sought after by the Allies and Germany alike, threnium gives steel astounding tensile strength. But the Zeppelin's flames bring more than a momentary halt to production. Ginna MacReedy, the burned...