The chapter on Esther in A Biblical-Theological Introduction to the Old Testament: The Gospel Promised is helpful for understanding the structure of the book. It also contains many of the insights we mentioned (like the chiastic structure, importance of humor, providence of God). A short accessible commentary on Esther is Debra Reid’s volume in the TOTC series. Interested listeners may also want to check out Karen Jobes volume in the NIV Application Commentary series, as well as David Firth’s The Message of Esther in the Bible Speaks Today series. As always, check out the Bible Project video on Esther: https://youtu.be/JydNSlufRIs