Where is Buster in the Bible?

Last night during Family Home Evening Erin was asked to share her favorite scripture story. She started off "She was a Jewish Queen and someone told the King to kill all the Jews. She had courage to tell the King she was a Jew and help the people, even though he could have killed her. BUSTER SAVED HER PEOPLE!" "Um, E I think you mean Esther". "Oh ya, Esther" :)