Chapter 1

The clock on the security desk ticked past 2:58 AM, and Marcus Reed felt the familiar prickle of unease crawl up his spine. The biotech tower of Veridian Labs loomed around him, a monolith of glass and steel that seemed to hum with secrets even in the dead of night. He sat in the dimly lit control room on the ground floor, surrounded by a bank of monitors that flickered with grainy feeds of empty hallways and locked doors. His thermos of black coffee sat untouched, steam long since faded. He didn’t need caffeine to stay awake—not tonight, not when the anomaly was due any minute.

Marcus had been the night-shift guard for six months, long enough to know the building’s rhythms. The whir of the HVAC system, the occasional creak of settling metal, the way the shadows stretched longer after midnight. But nothing unsettled him like Floor 7. Or rather, the thing that shouldn’t exist on Floor 7. Every night at 3:00 AM sharp, the thermal imaging system—an overengineered toy the company had installed to detect unauthorized personnel—picked up heat signatures on a floor that, according to management, didn’t even exist.

He leaned closer to the monitor labeled “Thermal Grid: F7,” his breath shallow. The screen showed a blank gray expanse, a digital void where no data should register. Veridian’s blueprints, which he’d pored over during his first week on the job, stopped at Floor 6. Research labs, clean rooms, and executive suites—all accounted for. Above that, straight to the roof. No Floor 7. And yet, every night, the system blipped to life with faint, pulsing red shapes. Human-shaped. Moving.

The clock hit 3:00. Marcus’s jaw tightened as the thermal grid flickered. There they were—three distinct forms, glowing crimson against the gray. They shimmered near what would be the southeast corner of the nonexistent floor, pacing in tight, deliberate circles. His fingers hovered over the keyboard, itching to log the anomaly again, but he stopped himself. He’d reported it twice already. The first time, his supervisor, a wiry man named Greg with a permanent scowl, had laughed it off as a glitch. “Old system, Reed. Probably picking up heat from the vents or something. Ignore it.” The second time, Greg’s tone had sharpened. “There’s no Floor 7, understand? Drop it.”

Marcus hadn’t dropped it. He couldn’t. Not when the shapes moved with purpose, night after night, like ghosts haunting a space that shouldn’t be there. He’d started timing them—always ten minutes, never more, never less. At 3:10, they’d vanish as if they’d never been. He’d checked the elevators, the stairwells, even the maintenance logs. Nothing. No access points, no records of renovations. Just a void in the building’s design that somehow bled heat and movement.

He rubbed the back of his neck, the stubble on his jaw rough against his palm. At thirty-four, Marcus wasn’t the type to chase conspiracies. He’d taken this gig for the solitude, for the steady paycheck after a messy divorce had left him with nothing but a rented studio apartment and a stack of bills. Six years in the Army had taught him to follow orders, to keep his head down. But it had also taught him to trust his instincts, and right now, every instinct screamed that something was wrong.

The control room felt colder tonight, the silence thicker. Beyond the monitors, the lobby stretched out in darkness, the glass doors reflecting the faint glow of streetlights from the empty parking lot. Veridian Labs sat on the edge of the city, a gleaming fortress of innovation surrounded by industrial sprawl. By day, it buzzed with scientists in crisp white coats, their ID badges glinting as they swiped through turnstiles. By night, it was Marcus’s domain—him and the ghosts of Floor 7.

He glanced at the thermal grid again. The shapes were still there, their movements hypnotic. One paused, as if sensing something, its crimson outline tilting like a head turning. Marcus’s pulse quickened. He told himself it was nothing, just a trick of the imaging, but for a moment, he swore it was looking at him. Through the screen, through the walls, straight into the control room.

“Get a grip,” he muttered under his breath, dragging a hand over his face. He reached for the radio on his belt, then hesitated. Calling it in again would only get him a reprimand—or worse. Greg had hinted last week that “curiosity doesn’t pay the bills.” But sitting here, watching shadows dance on a floor that wasn’t supposed to exist, felt like complicity in something he didn’t understand.

He stood, the chair scraping against the tiled floor, and grabbed his flashlight. The weight of it in his hand was grounding, a reminder of countless patrols through dusty bases and darkened streets. If the system was glitching, fine. He’d check the upper floors himself, eyeball the stairwells, maybe even peek at the roof access. If there was nothing, he’d log it as a malfunction and be done with it. If there was something…

He didn’t let himself finish the thought.

The elevator ride to Floor 6 was agonizingly slow, the hum of the cables the only sound in the confined space. Marcus’s reflection stared back at him from the polished steel doors—tired eyes, a furrowed brow, the faded scar on his left cheek a souvenir from a bar fight he barely remembered. He looked like a man who’d seen too much and slept too little. Maybe he had.

The doors slid open with a soft chime, revealing the sterile hallway of Floor 6. The air here was cooler, tinged with the faint chemical tang of disinfectant. Locked doors lined the corridor, each marked with cryptic labels like “BioContainment-3” and “GenSeq Lab.” He swept his flashlight over the walls, half-expecting to find a hidden panel or a forgotten stairwell. Nothing. Just the hum of overhead lights and the distant drone of machinery.

At the end of the hall, the stairwell door loomed. It was marked “Roof Access Only,” a heavy steel slab with a keypad that required a code he didn’t have. He pressed his ear to it, listening for any sound—footsteps, voices, anything. Silence. But as he pulled back, a faint vibration buzzed through the metal, so subtle he might’ve imagined it. A low thrum, like a machine powering up. Or a heartbeat.

His grip on the flashlight tightened. He glanced at his watch: 3:08 AM. Two minutes until the shapes vanished. He could wait it out, head back to the control room, pretend he hadn’t felt that pulse through the door. Or he could dig deeper, find a way up, see for himself what—or who—was hiding on a floor that didn’t exist.

Before he could decide, a sharp crackle burst from his radio, loud enough to make him flinch. Static hissed, then a voice cut through, distorted but unmistakable. Greg. “Reed, you there? Get back to the desk. Now.”

Marcus’s stomach dropped. He hadn’t called in, hadn’t reported his position. How did Greg know he wasn’t at his post? He pressed the talk button, forcing his voice to stay steady. “Copy that. On my way.”

But as he turned back toward the elevator, the stairwell door vibrated again—this time stronger, a rhythmic shudder that traveled up his boots. And from beyond it, so faint he could’ve sworn it was his imagination, came a sound. A whisper, or a moan, slipping through the steel like a secret meant for him alone.

He froze, the beam of his flashlight trembling on the door. Whatever was on the other side, it wasn’t nothing. And as the elevator doors closed behind him, sealing him back into the descent, Marcus knew one thing for certain: he wasn’t done with Floor 7. Not by a long shot.