The grandchildren of Henri Matisse’s muse, Greta Moll, are suing London’s National Gallery over a painting they say was stolen from their family after World War II. The heirs, who filed legal proceeding in a Manhattan federal court on Wednesday, September 7, are seeking the return of the painting or $30 million in compensation. The 1908 painting of Moll has been in the museum’s collection since 1979.