The story of Esther is one of those that has lead me to tell fifth and sixth grade boys that they shouldn't read the Old Testament because there is too much sex and violence in it. Which, of course, leads to them rushing to read it :)
The story of Esther is a story about doing what you can no matter where you find yourself. It's also about taking risks for the people that you love.
This story is the core of the Jewish holiday of Purim which features a telling of the story and the giving of sweets to each other, especially three cornered cookies supposed to represent Haman's hat.