World's Finest Comics #48

In "The Great Steel Mystery!", Superman and Lois Lane investigate a series of bizarre disappearances in Metropolis—bridges, safes, even a bank vault—each made of steel. When the mysterious Stålmannen steps in, the duo follows the trail to Miles Steel Works, where they uncover a dangerous flaw in a new alloy. With Perry White keeping the press on the case, the truth behind the vanishing steel begins to unravel, leading to a tense confrontation that tests both science and heroism.