Chapter 21 - A Chilling Final Warning Left At The Front Gate

Before Arthur could trace the incoming IP address, a sharp knock echoed softly from the heavy oak door of his private study.
He stood up, drawing his sidearm cautiously as he walked across the room and pulled the door open into the hallway.
The head of security stood there holding a small, unmarked black envelope bearing no postage stamps or return address.
“One of the gate patrols found this left on the exterior keypad terminal five minutes ago, Mr. Sterling,” the guard reported.
Arthur accepted the envelope with a steady hand, dismissing the guard before walking back over to his desk.
He tore open the black paper seal, pulling out a single photograph showing the Berkshire estate gates taken from an angle outside.
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Written across the back of the photograph in bold red ink was a final, chilling message that made his blood run cold:
“We are already inside the house.”