Auxerre is the setting of Colonel Ardenti’s search for Edouard Ingolf, the former dragoon who vanished after leaving the town for Paris in 1935. In Ingolf’s cottage, Ardenti finds a library of Templar history and cryptography, an old ledger annotation, and a handwritten sheet marked “Provins 1894.” The discovery gives the novel’s mysterious Provins message a material history, but the evidence reaches the reader through Ardenti’s eager reconstruction—and later through a reversal that makes his confident conclusions newly suspect.

A Disappearance Preserved in the Cottage

Ardenti locates the Ingolf family by searching telephone directories at the central telephone office in Paris. He finds only one, in Auxerre, and writes to the daughter of the man he has been reading about, presenting himself as an amateur archaeologist. Two weeks later, an elderly midwife replies. Curious about her father’s history, she asks Ardenti whether he can tell her anything; he travels to Auxerre and meets her in a small cottage whose wooden gate is fastened with string looped around a nail.

The daughter knows that her father served as a dragoon and left the service in 1895, before her birth. He bought the cottage, married a local woman with some money, and settled into a quiet life. Her mother died in 1915, when the daughter was five. Ingolf disappeared in 1935 after setting out for Paris, a city he visited regularly at least twice a year. The local gendarmerie contacted Paris, but he was never found; he was presumed dead. His daughter, left with a meager inheritance, spent her life without learning his fate or even where he might be buried. Her account makes the house a repository of absence: she can visit her mother’s grave, but all she can do for her father is preserve the study he left behind.

The Study and Its Evidence

The attic study remains clean and orderly. Ingolf’s daughter dusts it once a week, though she cannot read most of the books: they are in Old French, Latin, German, and Russian. Ingolf was born and spent his childhood in Russia, where his father had been a French Embassy official. The roughly hundred volumes in the room include works on the trial of the Templars, cryptography, secret writing, paleography, and diplomatic history. Among them is Raynouard’s rare 1813 collection of documents relating to the condemnation of the Knights Templar.

In an old account ledger, Ardenti notices an entry from 1895 recording the sale of a case, without describing it, naming its buyer, or giving a price. The entries around it are otherwise meticulous, and the ledger suggests that Ingolf carefully managed his savings and purchased antiquarian books in Paris. Ardenti interprets the blank entry as the trace of a valuable object found in Provins: he imagines Ingolf discovering a gold case set with precious stones, selling it, leaving military service, and using the proceeds to settle in Auxerre and study a parchment. The daughter supplies no independent confirmation of the case or parchment. The explanation is Ardenti’s conjecture, built from the ledger, Ingolf’s interests, and the unexplained disappearance.

The Paper Marked Provins

Ardenti searches the books for underlinings and marginal notes. When he clumsily drops a heavy volume, a handwritten sheet falls out. Its notebook paper and ink seem recent enough to date from the last years of Ingolf’s life; in the margin Ardenti sees “Provins 1894.” He concludes that Ingolf had taken an original parchment to Paris and that the sheet is a copy. He pockets it without the daughter’s knowledge, reasoning that she had dusted the books for years without finding it and should remain unaware. His account frames the theft as a victory after earlier defeat, while describing Ingolf’s daughter as a woman already condemned by fate.

At the meeting where Ardenti presents the text, he offers a photocopy, explaining that he wants to spare the original further wear. Casaubon points out that Ingolf’s copy is not the original parchment. Ardenti answers that when originals no longer exist, the last copy is the original, then insists that Ingolf’s transcription must be true because he can see no way for the truth to be otherwise. The exchange turns a fragile chain of custody into a declaration of certainty: the parchment is absent, Ingolf’s copy is treated as definitive, and Ardenti’s conviction substitutes for verification.

From Cipher to Reversal

The sheet contains two texts. One is a densely written, demoniacal litany that Ardenti calls a parody of a Semitic language. To decipher another passage, he claims to test systems associated with Trithemius, first taking the initial letter of each word and then applying a simple letter-shifting method in which each letter is replaced by the one that follows it to decode. He presents the result as a Templar message announcing thirty-six invisibles divided into six groups. The procedure appears to give the paper a historical and ritual significance, but its interpretation depends on assumptions about the text, the cipher, and its date.

Much later, Lia’s reading of the evidence offers a simpler alternative. The French wording in the message, she observes, resembles an expression current in a seventeenth-century pamphlet about the Rosicrucians. If the text uses a Trithemius cipher and quotes language associated with the Rosicrucians, that does not prove that the Templars originated the Rosicrucian Plan; it may instead show that the message was composed later. On this account, Ingolf could have found a Provins message and, as an enthusiast of hermetic writing and cryptography, recoded it himself as an exercise. Auxerre’s study therefore anchors both the apparent discovery and its demystification: the surviving books, ledger, and copy are real objects, but the grand history Ardenti constructs from them remains an interpretation, not a proven transmission.