Paul Rosenberg was one of the most famous art dealers in Paris with paintings from Picasso, Mattise and modern masters in his gallery. But when the Nazis arrived and banned many of the pieces in his collection, Paul Rosenberg fled Paris and the precious paintings were stolen, lost or destroyed. His grand-daughter, who Picasso himself once asked to paint, returned to Paris and became one of best-known journalists in France. She was also married to former IMF chief Dominique Strauss-Kahn when he was accused of rape at a New York Hotel. She's returned to public life with a new book called 'My Grandfather's Gallery: A Family Memoir of Art and War'.