Thanks to Schindler's List, most people know the name Oskar Schindler, but other unsung heroes emerged during World War II to risk their lives by saving the innocent from extermination. This History Channel documentary profiles four of them in depth. Segments focus on the selfless actions of foreign diplomats Hiram Bingham (United States), Carl Lutz (Switzerland), Aristides de Sousa Mendes (Portugal) and George Ferdinand Duckwitz (Germany).