Is "Salvator Mundi" a real Leonardo da Vinci painting? Two years ago, the painting titled “Salvator Mundi,” set a record as the most expensive piece of art ever sold at an auction. The image of Jesus is one of fewer than two dozen works attributed to renaissance master Leonardo da Vinci. But in a new book, one author paints a different picture, questioning if the painting is a genuine Leonardo. Author Ben Lewis joins "CBS This Morning Saturday."