Esther stands out to me in this category of saving her entire nation with her courage. Chosen to join the harem of Persian King Xerxes, as she rises to the position of queen in time to uncover a plot to destroy the Jewish people. Only by risking her own life would she be able to have the power and influence to stop the plot. God is not mentioned at all in the book specifically, but His fingerprints are all over the events. A powerful story.