Fire of the Sun is set in early 1939, when a cold chill grips the spy networks of Europe. There are terrible rumours, dark whispers of the discovery of a vast reservoir of ancient knowledge by the Axis Powers. Wrapped up in the chaos and confusion of the rising tensions across the continent, these stories make no sense.

The repeated warning from Allied agents is that Nazi archaeologists have unearthed a store of esoteric information covering a broad range of advanced technologies - mechanics, electronics, communications, propulsion and avionics, especially of strange-shaped aircraft.

Analysts are struggling to believe this, but cannot deny that people are being killed to maintain the wall of silence. British intelligence services find themselves chasing a trail of secrets from country to country, arriving at each scene seemingly moments too late.

An espionage battle ensues to try and prevent this knowledge from being converted into weapons of war. But can know-how be destroyed? And what about those who already have the knowledge? The decision is made to try and capture them instead.