I'm not sure how much is out there that's specifically out there about Nazi mysticism - I could try and find out for you though. There is a book called "Black Sun" which Butchers recommended a while back but I haven't read it and that is supposed to be the most reputable work on the topic.
a lot of these are books I read years ago and haven't read since so I may well be missing stuff etc. And I am sure that someone will be along to tell me why they're crap
If you are looking for a book about the ideology of fascism and the role of "faith" and pseudo religious fervour in it that he describes, then John Weiss's "fascism" is very very good, anything by Roger Griffin and Mark Neocleous also cover the same ground.
Ian Kershaw's "Hitler: Hubris" and "Hitler: Nemesis" as well as, I think, both very reputable, well-researched biographies of Hitler which do a very good job of demolishing some of the crap that has built up around it (that he was gay, that he was jewish etc).
I have also read Michael Burleigh's "Death and Deliverance" which was about Aktion-T4, how it was implemented and the ideology behind doing it. I think his other books are also meant to be quite good but I get the feeling he may be a bit of a tory - not sure though.
Mason's "Nazism Fascism and the German Working Class" about working class Resistance in Germany and Saul Friedlander's "years of extermination" which is quite good as an account of the Shoah but from what I can remember (maybe I missed something while reading it) it doesn't really go into the detail of why anti-semitism became so popular in Germany and doesn't really give much "back story".
There's a book about
Nazi doctors in Auschwitz with interviews of ex war criminals by Robert Jay Lifton which is all right, I do think that at times he may be a bit too sympathetic to his subjects though and it annoyed me how they spent loads of time pontificating about their moral dilemmas. It's quite interesting though but some of the descriptions are quite distressing.
There's plenty of propaganda material from the Nazis on
this page (if you can stomach it) and you can read their mystical bollocks for yourself. He has also written a book on Streicher which I haven't read but which is meant to be good.
Joachim Fest who wrote a book about Nazi war criminals including
a chapter on Alfred Rosenberg who he describes as somebody who was a misfit among the nazis and who launched some half hearted protest and appeared not to fully realise what his philosophies about "the jew" led to when he actually had any real power because he had spent most of his life up to his neck in shit books and never realised what his pseudo intellectual bullshit led to in real life.
There's another one I read ages ago about economics in the Third Reich, I can't remember the title though!