In 1937, as the Nazis gained control and anti-Semitism spread in the Free City of Danzig, a majority German city on the Baltic Sea, sixteen-year-old Justus Rosenberg was sent to Paris to finish his education in safety. Three years later, France fell to the Germans. Alone and in danger, penniless, and cut off from contact with his family in Poland, Justus fled south. A chance meeting led him to Varian Fry, an American journalist in Marseille helping...