December 1920. Bruges banker and collector Emile Renders bought a painting in very poor condition at a public auction. It was a copy of one of the Louvre's gems: the famous Magdalene from Rogier van der Weyden's Braque Triptych. Six years later, when it resurfaced, the unremarkable painting had mysteriously become a magnificent masterpiece, attributed to Hans Memling's entourage. How can this strange metamorphosis be explained?