The rest of Nehemiah tells of Nehemiah’s leadership after the walls are built. Ezra and Nehemiah work together to return Judah to following after God. The book of Esther also takes place during the time of Ezra. Esther lives in Susa, and through the events we read about today, becomes queen.
How does an unknown Jewish girl become queen? By God bringing together all the details. How do we end up in the places where we are? By God bringing together all the details.