Within a mountain at Thule in Greenland lies World War Two's last and most incredible secret: the remains of a lost civilisation with powers far in advance of any on earth today. Over sixty years after a Nazi expedition first stumbled on it, a sinister right-wing political organisation plans to use the legacy of this "master race" to achieve global domination. And now others, no less ruthless and dangerous in their own way than the Nazis, are coveting the technology. The stage is set for Ragnarok − the Twilight of the Gods, and the end of the world as we know it − unless Caroline Kent, struggling to control powers no ordinary human ought to possess, and her friends can somehow avert disaster.