The Plan
Foucault's PendulumThe Plan is an invented account of a centuries-long Templar conspiracy, assembled by Casaubon, Jacopo Belbo, and Diotallevi from historical fragments, occult traditions, and conjecture. It begins as a deliberate exercise in connecting ideas, but its authors grow habituated to their own method, and believers outside their circle treat the resulting fiction as revelation. The Plan’s decisive paradox is that it has no historical basis, yet belief in it gives it real effects: its supposed followers search for a map, pursue its imagined secret, and make the invention dangerous to its creators.
Construction from fragments
The Plan’s first remote connection to Casaubon comes through his presence in Belbo’s office on the day Belbo hires him. Casaubon later reflects that he could have been elsewhere, but that counterfactual says nothing about a design governing events; he was there, and so his life followed from that circumstance. The distinction between an actual event and a pattern imposed upon it becomes central to the Plan’s later appeal.
The immediate model for the supposed conspiracy is Colonel Ardenti’s reading of the Provins document. Ardenti supplies a confident reconstruction from damaged or illegible text, treating missing letters as recoverable evidence. He interprets a reference to six sealed items as messages for Templars, reads a broken sequence as relapsed knights preparing revenge, and turns uncertain wording into an elaborate timetable. In his account, six groups act at six places, serving terms of twenty years; six turns make 120 years, and the sequence beginning in 1344 reaches 1944. He then reads the number eighteen, the sum of the digits in 1944, as three times six, and extends the supposed design toward 2000 and the number 666. Each inference converts uncertainty into apparent confirmation.
The three researchers do not simply accept Ardenti’s scheme. They recognize that its arrangement is clumsy and that their own wider reading gives them more material with which to build a convincing one. Their work is compilation rather than discovery: they rearrange existing pieces and supply connections, treating the authority of tradition as a reason not to invent new ingredients. In this sense, the Plan is less a recovered secret than a construction made to look like one.
Their technique is made explicit when they consider using Abulafia to combine concepts drawn from occult books. A few notions, connective phrases, and repeated associations could be fed into the machine; the resulting repetitions could then be presented as prophecies, with gaps filled in by interpretation. The same logic appears in the account of the Provins message as an empty crossword: unlike a literal puzzle, its intersecting entries are concepts and events, linked by analogy rather than shared letters. A potato can lead to an apple by shape, an apple to a snake by biblical association, and the chain can eventually return to the potato. Because nearly anything can be connected, the method provides no reliable test for whether an analogy is probative.
The invented Templar history
As the Plan takes form, its interpreters give the supposed Provins instructions a detailed geography and chronology. They imagine a first meeting at Tomar, reasoning that the surviving Templars there could act freely and remain in contact with another group. They then describe a network of six locations, including the Castle, a Refuge, a house associated with the Paulicians, and the Stone. In this reconstruction, six successive grand masters in each group serve across 120 years; a meeting at Tomar in 1464 precedes an English-French meeting in 1584, and a later appointment is projected to 1824.
The scheme absorbs further historical and literary material. The familiar legend that Templars escaped to Scotland and entered Freemasonry is identified as a repeatedly copied story without a sound foundation, yet it supplies another connection for the Plan’s growing network. The Rosicrucian manifestoes are then read as references to the supposed Provins design: the grave of C. R. becomes an allegorical site, the promise of a treasure hidden for 120 years becomes evidence of a future historical transformation, and the mention of a sixth age or candelabrum is fitted to the sequence of appointments. The gap between expected meetings is interpreted not as evidence against the system but as a void that the system must fill.
The Plan also recruits the marriage of Elizabeth, daughter of James I, to Frederick V, Elector Palatine, in 1613. The wedding’s Templar allegories and the English-German associations around it are taken to suggest that Francis Bacon succeeded John Dee as grand master of an English Templar group, while Masonic proposals are recast as a way to gather initiates around a Baconian design. In another speculative extension, the scheme joins telluric currents to celestial ones and equates the center of the earth with the center of the sky. The hollow-earth theory, Agarttha, the Grail, and the philosopher’s stone become components of an imagined route to mastery of the world. These episodes show the Plan’s governing rule in action: if the design is to explain everything, no subject can remain outside it.
From game to conviction
At first, the researchers understand that their associations are unwarranted. They treat the work as parody, borrowing the logic of the writers they call the Diabolicals without claiming that the resulting history is true. But the intervals between their meetings change the conditions of the joke. Each of them gathers material and practices connecting it to the rest; over time, the habit of pretending to believe becomes difficult to distinguish from belief itself. Their research produces a whirling network in which each thing points to, and apparently explains, every other thing.
The Plan’s appeal lies partly in the order it imposes on contingency. Casaubon links his own presence at Belbo’s office to the Plan’s first remote contact, although his reflection on counterfactuals also recognizes that a different premise would have led him elsewhere. The Plan turns accidents and disconnected facts into a causal story with a destination. The more comprehensive that story becomes, the less room it leaves for the possibility that events are unrelated or unresolved.
That interpretive pressure also shapes Casaubon’s response to events around the researchers. Considering the disappearance of Colonel Ardenti and the death of a psychic and her lover, he imagines that a member of the Picatrix group silenced witnesses and misdirected investigators. He immediately recognizes the weakness of the explanation: it works only if a plan really exists, and the researchers invented theirs before reality seemed to anticipate it. The contradiction does not automatically release him from suspicion. Instead, the possibility that the invented fiction has somehow run ahead of its makers becomes another way to preserve the pattern.
The Plan’s totalizing demand is voiced as a test of its own validity: if it exists, it must involve everything; otherwise it explains nothing. The demand makes the system difficult to disprove. A confirming resemblance becomes evidence, while a gap, contradiction, or failed appointment can be absorbed as concealment or as an empty place waiting to be filled. In this structure, the absence of a connection does not end the search; it renews it.
Belief, action, and consequences
The consequences become unmistakable when Belbo tells Casaubon that the Plan is real and that people are after him. Casaubon cannot easily accept the claim. He knows the three of them made the Plan, yet wonders whether Belbo’s captors might be Rosicrucians, the Comte de Saint-Germain, the Okhrana, the Knights of the Temple, or the Assassins. He also considers that Belbo may have lost perspective, perhaps under the strain of his fascination with Lorenza and with the Plan itself. The list of possible pursuers reveals how the invented mythology supplies ready-made agents whenever the situation becomes frightening or uncertain.
Belbo’s relationship to the fiction is not simple credulity. Casaubon later concludes that Belbo took the Diabolicals’ universe seriously not because he had acquired strong faith, but because he had lost faith. Belbo uses a Plan he knows to be unreal to defeat a rival he believes is real; afterward, he recognizes that the Plan seems to have mastered him, as though he and the construction were made of the same substance. He goes to Paris seeking revelation and liberation. The game has crossed into conduct, and its author cannot simply withdraw from the role it has given him.
The danger also follows from the secrecy the Plan appears to promise. Belbo claims to possess a secret and thereby gains power over those who want it. The more he refuses to disclose it, and the more he denies possessing it, the more his pursuers take the denial as proof that the secret is genuine and important. The imagined secret grows precisely through the effort to extract it. Casaubon eventually understands the force of this mechanism but remains in danger: his pursuers believe he has the revelation they want, and insistence that there is no map makes them want it more.
The Plan’s apparent success therefore does not validate its account of history. It demonstrates the consequences of a fiction that others adopt as a guide to action. Once believers identify pieces of their own mythology as moments in the researchers’ scheme, the invented chain becomes socially operative. As Casaubon recognizes, if a plan is invented and other people carry it out, it exists in a practical sense, even though its alleged original design never existed.
Reversal and significance
Lia’s interpretation finally breaks the historical construction: the Provins message is a laundry list, there were no Templar meetings at the Grange-aux-Dîmes, and neither the Plan nor the message existed as the researchers had imagined them. The list itself has not changed. What changes is the interpretive apparatus around it. The researchers treated its open spaces as a crossword whose entries were concepts and events, then filled them until the pattern looked inevitable. Their ingenuity made the fabricated history coherent, but coherence was the product of their method, not proof of the history.
The reversal does not undo what the invention has set in motion. Casaubon sees that the imaginary design has persuaded its supposed inheritors to identify their own confused traditions with the Plan, joining them into what seems to be an irrefutable web of analogy, resemblance, and suspicion. He anticipates that they will continue through the world seeking the map. In that sense, the Plan is both nonexistent as a recovered Templar conspiracy and real as a belief capable of directing people’s actions.
The novel’s final emphasis falls on the difference between understanding a fiction and escaping its effects. Casaubon becomes certain that there is nothing to understand, but that certainty cannot persuade those who remain committed to the secret. They still want the map; the absence of a map deepens their demand. The Plan’s lasting force is thus not the revelation of a hidden order but the self-sealing logic by which an empty secret generates interpreters, pursuers, and consequences.