The Professor and Ace arrive in present-day London to find the city strangely changed. England is a republic, ruled by an elderly Lord Protector more interested in a mysterious comet than the long-suppressed forces of revolution fomenting in his kingdom. As political factions vie for power, the travellers become embroiled in the plans of King Charles XIV who stands poised to reclaim the throne. Can they discover who is behind the drastic alteration of history or will the Puritan cause triumph throughout eternity?

It is the time of the Second World War, and all is not well at a top secret research base in Greenland. The British have been testing a new device which could bring about a swift end to the war with Germany - but the trials have gone disastrously wrong. When the Professor and Ace arrive, they encounter an isolated community not only under threat from its human enemies, but stalked by a horrifying menace with a voracious appetite for survival.

"Now comes the time! Now the reckoning!" MILLANNO: a holiday planet of extreme wealth and extreme leisure - on one side. The other side of the planet teems with politicians, administrators, and also criminals. When the Professor and Ace decide to take a holiday, they are unwillingly pitched into a battle for supremacy on the planet. Separated and suddenly finding themselves on the lost and lonely Isle of Prosperity, they must find each other. But standing in their way is the determination of a mysterious figure from the past to reclaim the Directorship of the planet. As the Professor and Ace explore, a picture begins to emerge of a corrupt past, of political double-dealing, betrayal and vengeance. Who is Milo, the psychokinetic youth who inhabits the island? Who is Gabriel, who sounds like a machine, but talks like a schoolmaster? And who is the earthy Calida, and why is she out for revenge? A dramatic meeting of old enemies can no longer be postponed, and there is no way off the island...