They Used Dark Forces: Dennis WheatleyGregory Sallust Adventure No. VII. It is 1943, World War II, and secret agent Gregory Sallust is parachuted into Nazi Germany. Together with ex Bolshevik General Stefan Kuporovitch, they 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 Black Magician and when, 16 months later, they meet again, each decides to use occult forces in an attempt to