THE UNANSWERED LETTER: One Holocaust Family's Desperate Plea for Help

In 1939, as the Nazis closed in, Alfred Berger mailed a desperate letter to an American stranger who happened to share his last name. He and his wife, Viennese Jews, had found escape routes, hoping to follow their children to America. Decades later, Cassell investigates whether the Bergers' letter ever found a response. Photos.