A. Lidin's mystical action film, written in the best traditions of L. Child, P. Wilson and B. Lumley, is dedicated to the struggle of the Soviet state security agencies with the mysterious fascist organization Ahnenerbe. In Antarctica, not far from the German submarine base of New Swabia, an underground city is found, created by a civilization that ruled the Earth long before the appearance of the first man. Who will unravel the secrets of the Ancient Gods: the brave detective of the Third Department of the GUGB Vasily Kuzmin or SS Brigadefuehrer Karl Wiligut? Whose side will the mysterious servants of Cthulhu, who are closely following their struggle, take? What role will Ekaterina Ganskaya, sentenced to death, and the mysterious Baron Fredericks play in this story?...