Germany after Adolf Hitler came to power. “What was grandpa most proud of in his business?” he asked.“He was very, very proud to have acquired the Guelph Treasure, and then was forced to sell it to the Nazis,” she told him.That conversation set Leiber, of West Hollywood, California, on a decadeslong mission to reclaim some 40 pieces of the Guelph Treasure on display in a Berlin museum.