That book won't focus on cast iron. I have a few step by step cookbooks and while some cast iron is used, that's not the focus.
I see cast iron cookbooks in sporting good stores. If you have a Sportsmans Warehouse or a Cabelas near by, you'll find some cookbooks devoted to cast iron. You might also try Lodge and Campchef's websites:
The idos forums discuss the use of the cast iron dutch oven in quite some detail. http://forums.idos.org
although they focus on the outdoor use. The recipes work fine on stoves and in standard ovens.
Oh yes, Cee Dub Welch has good cast iron cooking too. Again, focusing on outdoor use, but transfer well too the home. http://www.ceedubs.com/