The Mysterons seek revenge for the destruction of their Martian base. Their target? No less than the Director General of the Asian Republics. Can Spectrum foil the Mysterons, or will Earth suffer the loss of a great leader
The Mysterons make their first mistake when Captain Black, revealed to have become a Mysteron agent, breaks into the Culver Atomic Centre and is exposed to radioactivity that will enable Spectrum to track him with directional geiger counters.
Spectrum Intelligence reveal two pieces of equipment for use against the Mysterons. Unfortunately the Mysterons have different ideas, and everyone in the conference, except Captain Scarlet (who left the conference to stop a Mysteronised Captain Indigo), find themselves in grave danger...
When the Lunar Controller announces the Moon's independence from Earth in the war of nerves with the Mysterons, Scarlet, Blue and Green journey to Lunarville 7 to investigate reports of an unauthorised complex under construction in the Humboldt Sea.
Captain Scarlet and the rest of Spectrum are in a desperate race against time to defeat the Mysteron's latest threat. The total destruction of the massive desalination plant at Najama, high in the Andes Mountains.