Just spent a week at a friend's place in NW Wisconsin. No TV, no internet, no telephone so far as I was concerned, just work in the woods and reading. Stayed in the basement as family members came and went from the bedrooms upstairs. There were a number of novels there. Looking for something to read upon retiring, I picked this one, having read Caidin's 'Marooned' at a kid and being intrigued by claims made in its postscript that much of it was based on fact, some of it having to do with Hitler and the Nazis.
Well, Hitler is discussed with some reference to history. Beyond this, however, there's little realism. What there is is a lot of violence, sadistic violence, and sexism. I'm not easily offended, but this adventure novel managed it. I've not read a James Bond novel since adolescence. This seemed like a poor imitation of those, except that Caidin's hero lacks the wit and charm of Fleming's. He's simply a cruel and immoral megalomaniac.
I'm not one for starting a book without finishing it. Here there was a quest and a mystery--and the promise of some connection to reality. As it happens, the conclusion is entirely unsatisfactory. The quest is completed, but its object remains effectively unexplained and nothing points to any real world I'm familiar with.