He is considered the richest German, yet he is arguably the most mysterious billionaire: Dieter Schwarz. Most people are familiar with his Lidl discount stores, but he himself is regarded as a phantom. Who is behind the discount store empire? How did the corporate group come into being? What is legend, and what is truth? This documentary tells the story of Lidl, which holds a few surprises. A fascinating family portrait. While researching in archives, filmmakers Annebeth Jacobsen and Frank Diederichs came across previously unpublished documents that offer insights into the history of the corporate group and the lives of its family members.