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There is also a science fiction element, clearly modelled on H.G. It assumes that Satan actually exists and that he endows his follower Mallacou with supernatural powers, especially telepathy and the ability to correctly predict the future - which becomes essential in later parts of the book's plot. While essentially a spy thriller on the very concrete background of Nazi Germany in the last part of WWII, the book has a considerable Fantasy element. He encounters Mallacou again when he is trapped in Poland attempting to smuggle out parts of a V1 rocket after several adventures including imprisonment and dinner with Hermann Göring the unlikely pair find themselves in Hitler's bunker during the siege of Berlin where they attempt to persuade him to take his own life rather than fight on. He is wounded following an air raid and encounters Ibrahim Mallacou a Jewish Satanist who uses hypnotism to relieve his pain whilst treating his injuries. In this novel Sallust is sent to investigate rumours of a German superweapon being built in Peenemünde. They Used Dark Forces is the final part of Gregory Sallust's wartime experiences.
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