The Book of Esther narrates the events surrounding Queen Esther, who uses her influence to save her people, the Jews, from a decree of extermination issued by the king's advisor, Haman. After a series of dramatic events including feasts, royal decrees, and a heroic revelation of Haman's plot, the Jews defend themselves and celebrate their deliverance with the feast of Purim. The book emphasizes themes of identity, courage, and divine providence, while also exploring the political dynamics of the Persian Empire during the reign of King Ahasuerus, likely identified as Xerxes.