Deepening, the low hum vibrated through the steel and glass, rattling the fragile orchid in Wrenley's hand. It wasn't just a sound anymore. It was a physical pressure, thrumming against her teeth, buzzing in her bones. Then, a sharp, piercing shriek tore through the air. Alarms. Not a fire alarm, but something more primal, more urgent. Red lights flashed, strobing against the polished chrome and the vibrant green leaves of her newly arranged plants. Wrenley gasped, dropping the orchid pot with a dull thud. Ceramic shards scattered across the pristine floor. Her heart hammered against her ribs. Fear, cold and sharp, clawed at her throat. “What… what is that?” she whispered, her voice barely audible over the deafening wail. Instinctively, she spun, searching for an exit. The grand double doors she'd entered through now glowed with an ominous red light around their seams. Looking closer, she saw a thick, metallic panel sliding down from above, clamping shut with a hydraulic hiss. The penthouse was sealing. Panic flared. This wasn't just a fire drill. This felt like a fortress closing its gates. She ran to the floor-to-ceiling windows, pressing her palms against the cool glass. Outside, the city lights blurred into streaks of fear-induced motion. Suddenly, a thick, opaque film bled across the glass from the edges, darkening it, obscuring her view completely. Within seconds, the vast expanse of the city vanished, replaced by a solid, unyielding black. Trapped. Her breath hitched. She stumbled back, hitting a pristine white wall, her fingers scrabbling for purchase on the smooth, cold surface. Every door she passed, every window, was systematically locking down. The air grew heavy, thick with the metallic tang of emergency systems. Was this a security breach? An attack? Her mind raced, grappling with impossible scenarios. No one had warned her about a building-wide lockdown protocol. No one had even mentioned the possibility. Trying to calm her ragged breathing, Wrenley fumbled for her phone. Dead. Of course. Service was always spotty in these high-rise, impenetrable structures, but now there was no signal bar at all.

Chapter 2: Sudden Lockdown