I read The Shack after Dee recommended too and I loved it.
Like you, zjw, I had some serious forgiving to do toward a parent and that book helped me to realize I still had some letting go to do. It's not easy and you're not at all horrible if you're not ready to forgive yet. For me, the forgiving came in surges rather than all at once.
And, if you like, check out our Book List:
http://www.soberrecovery.com/forums/...rituality.html