"That's basically how the process went." Jeanne sighed, "The assassin came straight through the front door without raising any alarm. He might have relied on simple deception to get in, then engaged in what seemed like casual business talks for a while. Once he confirmed that the non-standard terminal was closely linked to their main server..."
Amipako was taken aback: "Confirm... how is this... alright, I asked a foolish question, never mind, forget it."
If there was a wired connection, then the direction of the data cables would at least give some clues. It's said that those with a sensitive touch can feel the vibrations underfoot and perceive the locations of cable ducts within the walls, sensing the thickness and general material of the cables.
This is the most terrifying hacking method: directly breaking in, offline and into the intranet. No matter how sophisticated the firewall or even physical isolation, it can't stop this.