Picquart’s discovery of the Petit bleu gives him his first specific lead connecting Major Charles Ferdinand Walsin Esterhazy to the espionage traffic he has been examining. A torn pneumatic telegram card, addressed to Esterhazy and referring to a coded correspondent, opens a path from the German attaché’s discarded papers to a serving French officer. A second, fragmentary letter strengthens the suspicion: Esterhazy has been providing sketches in exchange for money. Yet the evidence does not arrive as a confession or a complete case. It is pieced together from scraps, indirect references, and a name Picquart does not recognize, leaving him to decide both what the documents mean and how cautiously to act.

The card reconstructed

The clue emerges while Captain Lauth is reconstructing torn documents found among Maximilian von Schwartzkoppen’s papers. As Picquart empties a paper sack onto Lauth’s desk, pale-blue fragments stand out from the grey and white scraps. They are thicker than ordinary paper. Lauth identifies them as pieces of a Petit bleu, a pneumatic telegram card, and notes that it has been torn into unusually small pieces. Several hours later, he brings Picquart a manila folder containing the card, painstakingly reassembled with transparent adhesive. Its right edge remains jagged where fragments are missing, but the message itself is legible.

The short note asks its recipient for a fuller written explanation of a matter already discussed, so that the sender can decide whether to continue an association with the house of R. It is signed with the initial C. Picquart asks whether C refers to Maximilian von Schwartzkoppen; Lauth confirms that Schwartzkoppen uses that code name. The message does not name Esterhazy as the sender, and its wording alone does not establish espionage. Its importance becomes clearer only when Picquart turns the card over.

The address reads Major Esterhazy, at 27 rue de la Bienfaisance. Picquart does not recognize the name, but the identification makes the otherwise oblique message suddenly consequential. He asks Lauth to check whether a Major Esterhazy serves in the French army. Lauth has already done so: Major Charles Ferdinand Walsin Esterhazy is listed with the 74th Infantry Regiment, whose garrison is in Rouen. That location recalls the house of R mentioned in the message. The clues point toward an officer in the French army, but Picquart and Lauth are still confronting an inference, not a completed proof.

A second document and a working hypothesis

The reconstructed card is not the only paper that bears on Esterhazy. Another damaged message, addressed for delivery by a concierge, is missing enough words to resist a complete reading. It refers to the sender’s father, money, conditions for continuing, and sketches previously supplied. It also says that the sketches being returned are not the last. The broken text is fragmentary, but its surviving phrases give Picquart a second, more substantive basis for suspicion.

Picquart reads the letter as evidence that Esterhazy has been handing information to the Germans, including sketches, and receiving payment from Schwartzkoppen. He takes the reference to the attaché’s father as a likely euphemism for a general in Berlin, and understands the complaint about the price as a dispute over the value of the intelligence. This is Picquart’s interpretation of an incomplete document, not an explicit statement identifying every participant or establishing the full arrangement. Lauth raises the possibility of a trap: if Schwartzkoppen knows his papers are being read, he could have planted misleading material in his wastebasket. Picquart acknowledges that risk rather than treating the documents as self-authenticating.

The Petit bleu itself also invites caution. Picquart recognizes Schwartzkoppen’s writing from months of reading his notes and drafts, but the card’s neat, formal hand does not resemble it. To Picquart, the lettering looks deliberately disguised, as might be expected if a foreign officer were communicating with an agent through the host country’s open mail. The message’s impatient, urgent tone suggests strained relations, while the pneumatic network could have delivered it to Esterhazy within an hour or two. But Picquart believes Schwartzkoppen ultimately did not send it: after copying it onto a prepaid fifty-centime card, the attaché appears to have shredded it and discarded it. The unsent message thus becomes evidence precisely because the wastebasket preserves what the sender tried to destroy.

From suspicion to investigation

Picquart does not immediately publicize the documents. He tells Lauth to keep them between the two of them for the present and directs him to investigate Esterhazy and seek other evidence. Lauth is uneasy and wishes Major Henry were there; Picquart replies that they can proceed without him until he returns. The decision keeps the lead within the intelligence office while beginning an inquiry into an officer whose name has surfaced through material from a foreign attaché’s papers.

The discovery also unsettles the assumptions behind the prosecution of Alfred Dreyfus. When Picquart later opens the supposed secret file used against Dreyfus, he finds circumstance and insinuation rather than a witness or document directly naming Dreyfus as a traitor. Its nearest approach is an initial in a reference to D. Picquart questions whether Dreyfus could have removed plans from the First Department as alleged, notes that the dates in the account do not fit, and considers whether the description of D matches Dreyfus at all. In a later search of the intelligence archives, he finds a report identifying the agent D as Jacques Dubois, a printer whose plans were publicly available; the report itself says Dubois had no access to classified material. This later finding gives the initial a different referent and further weakens the use of the secret file against Dreyfus.

The inquiry unfolds in a climate shaped by France’s defeat in 1870 and continuing anxiety about Germany. Picquart recalls that senior officers such as Charles-Arthur Gonse, Auguste Mercier, and Raoul le Mouton de Boisdeffre were marked by that defeat and by the perceived imbalance between the two countries. Their repeated three-to-two calculation—three Germans for every two Frenchmen, and a similar disparity in armament spending—helps explain the military leadership’s fear of a confrontation. Picquart regards their pessimism with contempt. Against this background, a possible French officer passing information to foreign powers is not merely an intelligence lead: it threatens an institution already inclined to see the Dreyfus controversy through the lens of national danger.

The evidence enters public dispute

As the investigation and the dispute over Dreyfus’s conviction widen, the secret file itself becomes a matter of public reporting. An anonymous article in L’Éclair claims that a secret file proved Dreyfus’s guilt and calls for its contents to be published. Picquart counts those who have had access to the dossier: ten people in the military chain of knowledge, the seven judges, President Fauré, the president’s doctor, and Mathieu Dreyfus, among others. The growing circle makes secrecy difficult to maintain. Picquart’s conclusion is that modern photography, telegraphy, railways, and newspapers make the old ideal of a sealed inner circle untenable; he suspects that publicity will nevertheless make Gonse and Boisdeffre more anxious to restrict the investigation.

Esterhazy eventually makes Picquart himself the subject of public accusation. In an interview reported by Le Matin, he claims Picquart was responsible for the affair, had opened an investigation against him, and had supplied information to Auguste Scheurer-Kestner through Louis Leblois. Picquart sees his name in a newspaper for the first time and describes the sudden exposure as a searchlight falling on a man accustomed to working in the shadows. At a later gathering hosted by Georges Charpentier, Picquart meets Mathieu Dreyfus, Georges Clemenceau, Arthur Ranc, Joseph Reinach, and Émile Zola. He tells the group he must speak and leave quickly because every additional minute together increases the risk that the meeting will be discovered. The clandestine inquiry has crossed into political and public life.

The contest over what counts as proof continues in court. During Émile Zola’s trial, Georges de Pellieux asserts that the Ministry of War received absolute proof of Dreyfus’s guilt in November 1896, citing a document about a deputy asking questions and the alleged relations with a Jewish man. Picquart recognizes the reference as the letter supposedly retrieved from the German Embassy, previously read aloud by Jean-Baptiste Billot but not shown to him. He signals to Fernand Labori that Pellieux has made a damaging mistake and should be pressed on it. The scene returns the case to the problem exposed by the original discovery: documents circulate, disappear, and acquire authority through the claims made about them, while their origins and meanings remain open to challenge.

The Petit bleu does not, by itself, settle every question about Esterhazy or prove the full espionage arrangement. Its decisive force lies in redirecting scrutiny. A name on the reverse of a reconstructed card leads from Schwartzkoppen’s wastebasket to a French major; the damaged letter suggests payments and sketches; later archival findings undermine the claim that Dreyfus was the agent designated D. Together, these clues make it increasingly difficult to treat the original accusation as secure, while the military response and the public exposure of secret evidence turn a quiet intelligence inquiry into a wider institutional crisis.