A thrilling exposé recounting how members of Opus Dei—a secretive, ultra-conservative Catholic sect—pushed its radical agenda within the Church and around the globe, using billions of dollars siphoned from one of the world’s largest banks. For over half a century, Banco Popular was one of the most profitable banks in the world—until one day, in 2017, when the Spanish bank suddenly collapsed overnight. When investigative journalist Gareth Gore was dispatched to report on the story, he expected to...