I don't know much about Eric Norden except that he conducted a lot of the Playboy interviews 30-35 years ago. And he wrote at least one novel, The Ultimate Solution, published in 1974, the year of the novel's setting.
The book is an alternate history police procedural, narrated by an NYC cop named Bill. In his world, Germany won WW11, and all the Jews in the world have been exterminated. Except that one has suddenly appeared in NYC. Bill and a member of the Gestapo are assigned to find him. You think cops in regular police procedurals wander through a dark and terrible world? You should read about Bill's.
To Bill, there's nothing unusual in what he sees. He just tells us about it without comment or surprise. The reader, however, is likely to be surprised. Not to mention horrified and disgusted. What we might consider depraved is just more of the usual to Bill. Even 30 years after its publication, this novel has the ability to shock. Just one example: crucifixion as entertainment in cheap nightclubs.
I read The Ultimate Solution when it was first published, and I've remembered it ever since. Last night I pulled it off th shelf and read it again just to see if it was as powerful as I remembered. It is. Only 140 pages, but it packs a heck of a punch.
I'd suggest that you check it out, but I looked on the 'Net and saw only a couple of copies for sale, the cheaper of the two being $100. It's good, but it's not that good.