It was in the winter of 2016 that Jan Six, a Dutch art dealer based in Amsterdam, made a discovery that would upend his life. He was leafing through a Christie’s catalog when he spotted a painting featuring a young man wearing a dazed look, a lace collar and a proto-Led Zeppelin coif. Christie’s had labeled it a painting by one of Rembrandt’s followers, but Mr. Six knew it was by the Dutch master himself.Today on The Sunday Read, a look at Mr. Six’s discovery of the first new Rembrandt painting in over four decades, and the fallout from finding it.This story was written by Russell Shorto and recorded by Audm. To hear more audio stories from publishers like The New York Times, download Audm for iPhone or Android.