In April 1945, Himmler's SS robbed Germany's National Depository, the Reichsbank. As well as the tons of gold bullion, millions in currency, jewels and other valuables, the Nazis already had billions of dollars' worth of art, stolen from doomed Jewish families, hidden away in the mountains of Bavaria and Austria. 70 years later, Kurt Kohler, art hunter and researcher, travels the world looking for works to retrieve and return to their owners' descendants...