A low, rhythmic hum that vibrated in the floorboards, more like a heartbeat than an engine.

As the train lurched forward, the city lights blurred into long, electric ribbons. The Dub 14 was famous for its speed, promised to reach Florence in a record-shattering ninety minutes. But tonight, the atmosphere felt heavy.

Every time the train passed through a tunnel, the reflection in the window seemed to change. The Shift at Kilometer 80

The station clock in Rome ticked toward midnight as the "Dub 14" hissed at Platform 4. It wasn't just an express train; it was a silver needle threading through the dark heart of Italy.

Lia sat by the window, her breath fogging the glass. She held a heavy brass key, the only thing her grandfather had left her, labeled simply: Firenze - 14 . The Midnight Departure

Halfway through the journey, the lights flickered. The digital display above the door, usually showing the speed, began to count backward.