"A notorious mafia boss spent over three million dollars trying to cure his twin sons' mysterious illness, while arrogant specialists failed for two years. Then I walked into his mansion as the new nanny, dismissed the doctor who called me 'household help,' and noticed one hidden detail in the air vents that no one had ever thought to question."

Before my eyes could adjust to the inky blackness, the steady hiss of the aerosol canister suddenly changed pitch, replaced by a rapid, mechanical clicking sound.

Hissssss.

“The override valve!” I yelled over the hiss, coughing as a sharp, artificial sweetness immediately began to saturate the air in the confined maintenance room. “They’ve triggered the emergency purge! They’re flooding the room with the gas!”

Nathan didn't hesitate. He lunged across the concrete floor, his hands slamming against the heavy iron door, but the electronic deadbolt held firm against his weight. He fired two rounds directly into the electronic keypad, sending a shower of sparks cascading across the wall, but the security mechanism was hardwired into an independent battery backup.

“The keypad’s dead!” Nathan shouted, turning back toward me as he pulled me down behind a thick concrete utility pillar. “They’ve locked us in!”

“There has to be a secondary ventilation override or an emergency hatch!” I coughed, my chest tightening as the sweet, chemical fog began to settle around our ankles. My head spun, a heavy, lethargic numbness creeping rapidly into my limbs. The neurotoxin was designed to subdue quickly.

“Hold my belt!” Nathan commanded, his voice already sounding strained as the gas took effect. With terrifying strength, he slammed his shoulder against the side utility panel housing the manual duct levers.

With a deafening screech of rending metal, the steel access panel gave way, revealing a narrow, dust-choked ventilation shaft leading upward into the dark belly of the mansion.

“Up! Go!” Nathan shoved me toward the opening, lifting me by my waist as my fingers clawed desperately at the sharp metal edges of the duct.

“What about you?” I gasped, coughing violently as my vision blurred at the edges.

“I’m right behind you! Move!”

I scrambled into the dark, claustrophobic metal tunnel just as Nathan hauled himself up behind me, slamming the service panel shut to block the worst of the incoming gas. We crawled blindly through the narrow ductwork, our elbows and knees scraping against jagged rivets, following the upward draft of fresh air until we finally punched through a loose floor vent in the main laundry room on the ground floor.

We tumbled out onto the tile floor in a tangle of limbs, gasping for oxygen as the cool, clean air hit our lungs like cold water.

Nathan rolled onto his back, his chest heaving, his face pale and slick with sweat. For a terrifying minute, I thought the poison had overwhelmed his heart. But then his eyes snapped open, blazing with a cold, terrifying fury that could have melted steel.

“Mrs. Bennett,” Nathan rasped out, pulling himself up by gripping the edge of a commercial washing machine.

I coughed, wiping a smear of soot and dust from my cheek. “The house manager?”

“She’s the only other person besides Reeves who has the override codes to the sub-level junction room,” Nathan snarled, pulling his Glock from his holster and checking the slide. “She’s been running this household for fifteen years. I trusted her with my life—and she let them poison my sons.”

Before we could move toward the kitchen, the heavy oak doors of the laundry room swung open.

Mrs. Bennett stood in the doorway.

Gone was the prim, impeccably groomed house manager who had greeted me with polite disdain upon my arrival. In her hand, she held a sleek, silenced Walther PPK pistol, pointed with chilling precision directly at Nathan’s chest.