They Used Dark Forces tells how Gregory Sallust allies himself with Satanic powers in an attempt to destroy Hitler. The beautiful (but by now promiscuous) Sabine, and Sallust's geat love Erika von Epp, play their parts in a stupendous drama which ends with the Russians fighting their way into the flames of Berlin while Sallust comes face to face with his most implacable enemy, the sadistic SS Gruppenführer Grauber...