The Pit-Prop Syndicate

Freeman Wills Crofts's classic tale from the golden age of crime fiction! While traveling in France, a British wine importer named Seymour Merriman comes upon a manufacturing operation for the support beams used in mine shafts ("pit-props"). However, all is not what it seems. The enterprise's delivery truck has a license plate which changes numbers, and Seymour's investigations lead him to discover a troubling conspiracy at work.