During World War II, the Nazis plundered tens of thousands of works of art from the private collections of European Jews, many living in France. About 75 percent of the artwork that came back to France from Germany at the end of the war has been returned to their rightful owners.
But there are still approximately 2,000 art objects that remain unclaimed. The French government has now begun one of its most extensive efforts ever to find the heirs and return the art.
It's been 70 years since the letters of John Pryor were understood in their full meaning. That's because as a British prisoner of war in Nazi Germany, Pryor's letters home to his family also included intricate codes that were recently deciphered for the first time since the 1940s.
Pryor's letters served their purpose in World War II, as Britain's MI9 agents decoded the messages hidden within them — requests for supplies, notes about German activities — before sending them along to Pryor's family in Cornwall.