The ultra-conservative Catholic organisation Opus Dei was founded a century ago in Spain. Today, it's an international movement with around 90,000 members. In its home country, it has managed to infiltrate all spheres of modern society, from schools to hospitals. Despite serious allegations against it, Opus Dei remains a powerful force in Spain. FRANCE 24's Maude Petit-Jové, Mathilde Lopinski, Emile Roger and Sarah Morris report.