A billionaire had already spent more than $3 million trying to save his mysteriously weakening twin sons when his private doctor laughed at me for thinking a nanny might notice what specialists had missed. Hours later, I found something hidden in plain sight outside the boys’ bedrooms, and the terrified look on a housekeeper’s face told me their illness might not have been a mystery at all.

The sub-basement of Moretti Manor was a labyrinth of exposed stone foundations, industrial piping, and roaring machinery that dated back to the estate's construction in the 1920s.

I tore through the dimly lit corridors, following the thick silver-jacketed trunk lines of the modern HVAC system. The smell of the synthetic toxin was stronger here—a thick, nauseating cloud of artificial almond and ozone that made my eyes water and my throat burn.

I reached a reinforced steel door marked *HVAC SECTOR 4 - PEDIATRIC SUITE & MASTER WING*.

The door was unlocked. Inside, the room was bathed in the harsh white glow of fluorescent strip lights. Mounted to the primary air-handling unit was a commercial-grade, multi-channel automated micro-injection system. Four twelve-inch glass cylinders filled with amber liquid were clamped into computerized dosing pumps, their digital readouts counting down in glowing green numerals: *CYCLE COMPLETION: 04:12.*

Blake hadn't just set up a localized diffuser in the hallway; he was flooding the entire second floor with a lethal concentration of VX-942 right now, ensuring that whatever life was left in the boys—and their father—would be extinguished before the transport vehicle even cleared the county line.

I lunged forward, grabbing the heavy iron pipe wrench resting on an adjacent maintenance cart.

With a guttural scream, I brought the heavy steel tool down across the manifold.

The glass shattered in an explosive spray of amber fluid and pressurized air. Sparks erupted from the shattered digital controller as the metal teeth of the wrench tore through the circuit boards and hydraulic lines. The warning sirens inside the unit began to shriek, a high-pitched electronic wail that bounced off the concrete walls.

"Stop her!"

The shout came from behind me.

I spun around, wrench raised, chest heaving.

Standing in the doorway was not Dr. Blake, but Thomas Graves, Vincent’s head of private security—a man Vincent had trusted for seven years to guard his family. Graves held a tactical taser in his right hand, his face set in a grim, emotionless mask.

"Drop the tool, Miss Morgan," Graves said coldly. "You're trespassing in an authorized mechanical zone."

"He bought you," I spat, my voice hoarse from the chemical fumes that were beginning to pool on the floor. "Blake bought you with Delacroix stock options. You let him pump chemical weapons into the rooms of the children you were sworn to protect!"

Graves didn't flinch. "Blake pays on time. Moretti has been a walking corpse for two years. This house was sinking anyway. Put the wrench down, or I will drop you right here."

"You're too late, Graves," I said, stepping backward toward the industrial emergency shut-off valve on the main water line. "Look at the console. The manifold is destroyed. The system is venting backward into the basement."

Graves glanced involuntarily toward the shattered glass and the hissing, aerosolized cloud expanding into the room.

That half-second was all I needed.

I didn't swing the wrench at Graves. I hurled it with all my strength into the primary halogen light fixture overhead.