Agarttha is the fabulous underground kingdom identified with the hidden seat of the King of the World, an occult center that the characters successively connect to the Templars, the Assassins, secret currents beneath the earth, and the machinery of modern Paris. It begins as a place reported in esoteric writing; as the Plan grows, it becomes a map onto which the conspirators project the hope that history’s apparent disorder conceals a single directing intention. The novel’s decisive complication is that this immense hidden world is at once an object of fascination and an example of how analogy can make invention feel like discovery.

The underground kingdom and its supposed ruler

Agarttha enters through the taxidermist’s account of Saint-Yves d’Alveydre. He describes the supposed underground headquarters of the King of the World as the occult center of a synarchic order. The idea is given a material point of approach in Paris: a building that appears to be an old house is actually a facade concealing a Metro ventilation flue. The taxidermist reads this ordinary infrastructure as a threshold to subterranean Paris, a concealed entrance to the underworld and the beginning of a journey toward the earth’s center. In his account, the hiddenness of the place is not incidental. The visible city is the screen behind which its true rulers must be operating. Saint-Yves’s account, as retold in conversation, makes Agarttha a complete civilization rather than a single secret chamber. A mysterious visitor, Hadji Scharipf, is said to have disclosed the dwelling place that Saint-Yves called “the place that cannot be found.” Beneath underground cities live five thousand sages who govern the kingdom. They study sacred languages in pursuit of Vattan, a universal language; their central dome receives light from the planet’s surface through mirrors and an alleged enharmonic spectrum, distinguished from the diatonic spectrum of ordinary physics. When their contemplation reaches mysteries too profound, they levitate, and their companions must restrain them to keep them from striking the dome. The sages are also credited with forging lightning, directing currents said to run between the earth’s poles and tropics, and breeding extraordinary animals: creatures with tortoise shells marked by yellow crosses, a single eye, and mouths at both ends, as well as many-footed animals able to move in any direction. These extravagant details give the imagined kingdom both an elaborate natural history and a claim to powers beyond ordinary science. The account is not presented as a neutral description of an established place. The characters argue over whether Saint-Yves was a fanatic or a visionary speaking figuratively about a hidden direction of history. The taxidermist’s answer replaces a literal monarch with a collective symbol: the King of the World may represent a Fixed Intention, successively embodied by people and priestly or chivalric orders. Agarttha thus offers a way to imagine historical continuity even when no stable ruler or visible institution can be identified. That flexibility is part of its appeal: it can be read as a physical kingdom, an occult metaphor, or the concealed agency that a confused history seems to demand.

A refuge in the expanding Templar story

Agarttha is recruited into the Templar legend when the narrator, while developing his interpretation of the Provins message, reasons that the dispersed knights must have followed a route through territories where they could find protection and allies. He places a proposed meeting in Jerusalem at the sacred rock in the center of the Mosque of Omar, where the Templars’ former site had stood, and imagines that a hidden core of survivors or Portuguese-connected Kabbalists might have been waiting there. For that route to make sense, he places the fifth group in the Balkans, associating it with the Paulicians and their supposed successors. Agarttha supplies another destination and a possible refuge for the dispersed order: the Templars, he suggests, may have taken shelter there and continued their custodial work. The claim draws force from the Plan’s ability to make different traditions appear mutually explanatory. The Assassins, the Paulicians, the Templars, subterranean rulers, and sacred geography can all be arranged as links in a single chain, even though the chain is produced by the narrator’s interpretation rather than demonstrated by independent evidence. The narrator eventually states the distinction that governs this method: the task is not to discover the Templars’ secret, but to construct it. Agarttha is especially useful to that construction because its very remoteness allows it to explain missing links. An inaccessible kingdom can house survivors, preserve a lineage, and connect far-separated episodes without being available for ordinary verification.

The underground center becomes a cosmic coordinate

As the Plan absorbs the Nazi genocide and hollow-earth speculation, Agarttha’s underground setting is made to coincide with a celestial pattern. The narrator’s conspiracy theory claims that the Nazis were searching for a hidden message among murdered Jews, one that would identify with the Pendulum the point beneath the earth’s concave vault where telluric currents meet. In this interpretation, the supposed current under the earth becomes equivalent to a celestial current: the Mystic Pole and the Heart of the Earth coincide, while the star pattern above repeats the arrangement of Agarttha’s subterranean passages. The Grail, the philosopher’s stone, and the center of the hollow earth collapse into one imagined terminal point. The Plan then recasts Hitler’s persistence in his bunker as a final attempt to control that point and become Master of the World. The sequence exposes the moral violence of a system that explains atrocity by forcing it into an occult design. The narrative records this as the narrator’s grotesque elaboration, not as a reliable account of the historical genocide. Within the Plan, however, Agarttha makes the linkage seem coherent: underground geography, cosmic order, racial destiny, and political power become different names for one supposed center. Its imaginative function is therefore inseparable from the danger of the method. Once every event is treated as evidence of the same hidden design, even mass murder can be pressed into service as a clue.

Paris as the visible face of Agarttha

In the narrator’s later paranoid vision, Agarttha is no longer merely a remote kingdom. It becomes the destination and hidden interior of an infrastructure spread across Paris. He interprets the Conservatoire as a laboratory, the Eiffel Tower as a probe, and Beaubourg as a transmitter and receiver serving the underground realm. The enormous, conspicuous building in the city’s center, with its pipes and ducts, seems to him a device for capturing and relaying messages to the center of the globe. What is publicly described as a radio apparatus becomes, in his reading, a gate to Agarttha and a monument of the Resurgentes Equites Synarchici. Most people, he thinks, either fail to recognize the Plan or deliberately avert their eyes, while its supposed agents continue toward their goal across six centuries. The shift from the hidden kingdom to the visible city gives the conspiracy its unnerving double perspective: Agarttha is both inaccessible below ground and supposedly displayed in plain sight. The same reasoning that turned a ventilation flue into an entrance now turns familiar public buildings into stages in a secret operation. This is a narrated delusion, not confirmation that the buildings serve such a purpose. Its force comes from the narrator’s growing inability to distinguish the city’s actual forms from the meanings he has imposed on them. Agarttha becomes less a place he could reach than the center required by his interpretation of everything around him.

The Plan’s method and the meaning of the place

The narrator’s eventual recognition that Lia’s reading is convincing dismantles the historical structure that had made Agarttha seem indispensable. The Provins message was a laundry list; there were no Templar meetings at the Grange-aux-Dîmes, no message, and no Plan. Looking back, he explains how the construction worked: concepts were joined by analogy, the chain was accepted if it eventually returned to its starting point, and the connections seemed more credible when other people had made them before. The method converts resemblance into apparent corroboration. Agarttha’s many associations—with underground passages, secret orders, sacred centers, and hidden rulers—make it an especially potent node in this network, but their accumulation does not establish the kingdom’s existence or the historical claims attached to it. The novel nevertheless gives the invented place a real narrative consequence. It offers the conspirators an image of unity beneath historical fragmentation, then shows how that image encourages them to treat every gap as proof of concealment. Agarttha can signify a persistent human desire for an unseen center that would make violence, chance, and historical change intelligible. But when the characters mistake the explanatory power of that symbol for evidence, the imagined kingdom becomes an engine of paranoia: a place that cannot be found can be made to explain anything.