Yes, it is very much about God's love. And the dialogue between Papa, Holy Spirit & Jesus, as well as with Mack, is very fascinating & refreshing.
A companion study would be helpful because it does get a bit deep, doesn't it? I found myself reading parts over again to grasp it. The author wrote the story as a gift to his children, so something tells me that he would not write a study book. But....you never know.
Check out the website:http://theshackbook.com/index.html