Chapter 9: The Oxygen Timer
The heavy steel vault door slammed shut with a deafening, metallic thud, sealing the mechanical deadbolts into place.
Pitch blackness swallowed the small room for a single, terrifying second before the emergency battery-backup lights flickered to life, casting a sickly yellow glow across the concrete walls.
“Damn it!” Agent Vance cursed, rushing to the inner manual override wheel and throwing his entire weight against the spokes.
The wheel didn't budge an inch; the electronic override system had welded the internal locking pins in place from the outside.
“She’s rerouted the control panel to the main security terminal upstairs,” Vance said, breathing heavily as he reached for his tactical radio.
“Command, this is Vance. We are locked inside the sub-basement vault at the Sterling estate. Status red. Send the heavy extraction team immediately.”
Static hissed through the radio speaker, followed by a wall of high-frequency interference.
“Agent Vance… come in… heavy jamming in the lower levels… we can't get a signal through the reinforced concrete,” a muffled voice crackled back before cutting out entirely into dead silence.
Clara gently lowered Arthur onto a cushioned leather bench in the corner of the vault, making sure he was still sleeping soundly despite the commotion.
She clutched Noah’s bloodstained journal in one hand and walked over to the digital display panel built into the wall beside the door.
A bright red LED countdown timer began flashing rapidly: 04:59… 04:58…
“The air filtration system,” Clara said, her voice eerily calm as she stared at the glowing numbers.
“She wasn't bluffing. The oxygen is being actively vented out of the room.”
Agent Vance joined her at the panel, pulling a multi-tool from his belt and desperately prying open the plastic casing of the terminal to expose the internal wiring.
“She’s using a remote master override from the panic room on the third floor,” Vance muttered, sweat beading on his forehead as he snipped a bundle of blue and yellow wires.
“If I cut the wrong circuit, the locking mechanism triggers a permanent thermal seal.”
Clara looked down at the open journal in her hand, her eyes scanning the handwritten notes scribbled on the margins of the medical files.
Noah had anticipated this exact betrayal.
Near the back of the book, tucked inside a folded envelope, was a small brass toggle switch with a wire harness.
“Noah left a manual bypass,” Clara realized, her fingers darting into the envelope and pulling out the small component.
“He called it the fail-safe circuit. He said if his mother ever tried to lock us away, this switch would break the digital relay.”
Agent Vance looked at the component, his eyes widening with cautious hope.
“Hand it here—quick! We have less than three minutes before the CO2 levels spike.”
Clara handed the brass switch over without hesitation.
Vance stripped the insulation off two exposed wires hanging from the terminal wall and jammed the toggle leads directly into the motherboard.
The red countdown timer froze at 01:12 with a harsh electronic squeal.
For a breathless second, nothing happened.
Then, with a loud mechanical clunk, the heavy steel vault door popped open half an inch, letting a rush of cool, fresh basement air flood into the room.
Before Vance could pull the door open all the way, the vault’s interior security speaker crackled to life again.
It wasn't Elena’s voice this time.
It was Marcus, sounding frantic, terrified, and completely unhinged.
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“Clara… if you’re hearing this… you need to get out of the house right now. Mother didn't just lock the vault… she set the timer on the main gas line.”
***
