They Used Dark Forces
Author: Dennis Wheatley
 
Was Hitler a Satanist? No actual proof has yet emerged, but there is ample evidence to suggest that he regularly consulted occultists.
They Used Dark Forces, which is set in the Second World War, features secret agent Gregory Sallust, this time in the company of an ex-Bolshevik General named Stefan Kuporovitch. Parachuted into Nazi Germany, the two of them join forces with the widow of a German diplomat who is in contact with Allied Intelligence. It is through her that Gregory becomes unwillingly involved with a Jewish Black Magician, and when, sixteen months later, they meet again, each decides to use occult forces in an attempt to destory the maniac Hitler once and for all . . .
 
ARROW BOOKS 5th IMPRESSION 1972
ISBN: 0099072602