The Ardennes enters the account as a destination that complicates the surveillance of two men connected to the investigation: Benefactor is reported to be on leave at his wife’s home there, and Esterhazy is later said to have moved there after going to ground. The text gives no further description of the region; its significance lies in the way these reports redirect the investigators’ attention beyond Paris and Rouen.

A Reported Place of Retreat

During a lull in the operation, the investigator reports that Benefactor remains on leave at his wife’s place in the Ardennes. The embassy is quiet, and neither of the two men under observation has been seen for weeks. With their target absent and an associate having left Rue de Lille for a holiday in Brittany, the surveillance has little to show. The Ardennes is thus mentioned as part of a broader interruption in the investigation, not as a scene of action.

Esterhazy’s Move

Later, Esterhazy’s disappearance gives the region a sharper importance. The report says he is no longer in Paris or Rouen and has moved out to the Ardennes. The investigators do not know whether he realizes they are pursuing him, but the uncertainty increases the pressure to act quickly and lay their trap. His reported relocation makes the Ardennes a point of concern in the effort to follow him, while leaving his precise whereabouts and awareness of the surveillance unresolved.