My fingers trembled as I stared at the neat, familiar handwriting filling the expensive stationery. The line burned into my retinas: I've known you your entire life. And for years, I've quietly watched over you.

The armored transport vehicle—a matte-black SUV with military-grade plating—sped through the subterranean maintenance tunnels beneath the city at breakneck speed. I sat in the back between Eleanor and Julian, staring out the bulletproof window at flickering emergency lights blurring into streaks of red and yellow.

My life as an ordinary marketing coordinator felt like a lifetime ago. A different world. A different person entirely.

"We're approaching the terminal," Julian announced, leaning forward to tap the driver on the shoulder.

The vehicle screeched to a halt inside a cavernous underground parking garage that smelled of exhaust and damp concrete. There were no security guards, no flashing signs—just a massive blast door set into the solid bedrock of the subterranean foundation.

We stepped out of the SUV, our footsteps echoing loudly in the hollow space. My heart hammered against my ribs like a trapped bird.

Eleanor led the way to a sleek, biometric control panel mounted beside the blast door. "Place your left hand against the scanner," she instructed, her voice steady. "And press the platinum ring directly against the glass interface."

I hesitated. I looked down at the ring—the simple, unassuming band Carl had slipped onto my finger while wearing a plain white T-shirt in his sunlit living room. “It would mean everything to me,” he had said.

Now, that simple gesture felt like an unbreakable chain connecting my past to a violent, terrifying future.

Slowly, deliberately, I raised my hand. I pressed the heavy platinum band against the glass sensor.

For a second, nothing happened. The screen flickered with a harsh red light.

Access Denied.

A cold knot formed in my stomach. Eleanor swore under her breath, and Julian's hand dropped instinctively to his holster.

"Wait," I whispered. "Look at the screen."

Below the red text, a secondary prompt was flashing in crisp, white lettering:

Awaiting Primary Passphrase. Enter the day the world stopped.

I blinked. The day the world stopped? What did that mean? Was it a date? A password? A historical event?

"Think, Oanh," Julian urged, stepping closer. "Did Carl mention a date? An anniversary? Something from the letters or your conversations?"

I closed my eyes, desperately searching my memory of the few months I had spent with Carl. We had talked about everything—books, travel, favorite foods, childhood memories. But we had never talked about a day the world stopped.

Unless...

My eyes flew open.

I remembered an afternoon sitting by his window while the rain poured outside. We had been drinking chamomile tea, and Carl had been staring blankly out at the wet street. I had asked him what he was thinking about, and he had given me a strange, melancholic smile.

“The day I lost my brother,” he had said softly. “March 14th, five years ago. That was the day the world stopped spinning for me.”

With trembling fingers, I reached out to the touch-sensitive keyboard beneath the screen and typed in the numbers: 0 3 1 4.

Click.

The heavy, mechanical sound reverberated through the entire chamber. The red light shifted instantly to a brilliant, glowing blue.