Yes, Megillat Esther, as the book is properly called, means revealing the concealed/hidden. Rabbi Pinchas Stolper has written an excellent book on Purim called, “Purim In A New Light.” You can read it on Google Books
or you can buy it on Amazon.
http://www.amazon.com/Purim-New-Light-Grandeur-Revealed/dp/1931681309/ref=sr_1_1?ie=UTF8&s=books&qid=1297195717&sr=8-1
Thank you . I’ll look for the book. What is your email? I want to show you somthing interesting.