I have yet to read that book you mentioned. I loved In The Presence of Mine Enemies. His series about an alternate timeline where the US Civil War had ended in a stalemate and there was a Union and a CSA and then there was a rise of a nazi like figure in the CSA. I believe there is one more book in the series that I haven't gotten to yet, but it is very good. Guns of the South is another one of his that is a great read. His characters and settings he drops them in are main reason I keep returning to his stuff, even some of his earlier fantasy novels which really isn't my favorite genre.