My eight-month-old triplets screamed for two hours. Three nannies tried everything.

Julian reached the upper landing with Marcus and Victoria right on his heels.

The corridor outside the nursery was illuminated only by the crimson glow of the emergency exit signs. The two security guards stood with their carbines raised, flashlight beams cutting through the gloom, pointing down the narrow access corridor that led to the estate’s secondary breaker panels.

"Status!" Marcus barked.

"The smart breakers tripped simultaneously on East Wing Sub-Panel B," Guard Jackson reported, his voice tense. "The manual override lever is jammed. The nursery’s internal air filtration system is on reserve battery, but the ballistic shutters are locked in the down position. If the temperature spikes, we won't be able to cycle fresh air."

Julian stepped past them and placed his palm against the nursery door’s biometric scanner. The glass plate was dead. The red LED was completely dark.

"They cut the localized fiber loop," Julian said, his voice terrifyingly steady. "Someone is physically on the grounds, manipulating the sub-distribution panels. Marcus, where is Elena and Sophie?"

"In the family suite, basement level west," Marcus said, pulling his radio. "Elena, do you copy? Elena, report."

Static hissed through the radio. Then, a faint, terrified whisper broke through the white noise:

*"Mr. Julian... there’s someone outside the window. Sophie saw him. He has... he has Clara’s face on a screen..."*

The transmission cut out with a violent burst of electronic feedback.

"Jackson, stay on this door!" Julian ordered, not wasting a single second. "Nobody breaches this nursery! If anyone approaches without my voice clearance, shoot to kill!"

Julian sprinted toward the west wing stairs, bypassing the elevators. Marcus followed, unholstering his weapon and switching off the safety with a crisp, metallic snap. Victoria tried to keep up, kicking off her high heels and running barefoot along the cold hardwood floors.

"Julian, wait! It’s an ambush!" she pleaded. "You don't have body armor!"

"Those are my children, Victoria!" Julian roared over his shoulder. "And Elena and Sophie are under my roof! I don't give a damn about body armor!"

They reached the basement level—a subterranean complex housing Julian’s wine cellar, the master server vaults, and the private living quarters for the live-in household staff. The air down here was cooler, humming with the deep, low vibration of the climate-controlled server racks fifty feet down the hall.

The door to Elena’s family suite hung ajar by two inches.

Marcus moved ahead, weapon raised in a two-handed combat grip. He sliced the pie around the doorway, clearing the blind corners with surgical speed. "Clear!" he called out.

Julian pushed past him into the room.

Elena was huddled in the corner between a wardrobe and the bed, her arms wrapped tightly around Sophie. The four-year-old girl was trembling violently, her face buried in her mother’s chest, but she wasn't crying. Her little hands were clamped over her ears.

"Elena!" Julian dropped to his knees in front of them. "Are you hurt? Did anyone touch you?"

"No, Mr. Julian," Elena sobbed, rocking her child. "We heard a tapping on the high window well. Sophie looked up. She said a man was standing in the shadows, holding a speaker against the glass. And then... then I heard her. I heard Mrs. Clara crying for help. It sounded so real, Mr. Julian... sweet Mother of God, it sounded like she was freezing to death in the snow."

Julian looked up at the narrow window near the ceiling that looked out onto the sunken garden well. The glass had a circular suction mark on it—the residue left behind by an acoustic resonance transducer.

"They're using the building’s structural materials as physical speakers," Julian murmured, standing up. "They’re turning the entire house into an acoustic torture chamber. They want me disoriented. They want me panicked."

"Why?" Victoria asked from the doorway, her chest heaving as she caught her breath. "If they wanted to kill you, Julian, they have the tactical capability. They could have breached the perimeter with sniper fire or high-yield explosives. Why this elaborate, psychological horror show?"

"Because of the clause," Julian said, turning to her, his eyes dark with sudden clarity. "The M.E.S. corporate continuity charter."

Victoria froze.

"What clause?" Marcus asked, keeping his weapon trained down the dark hallway.

"When I founded Moretti Estate Systems," Julian explained, "I wrote an ironclad mental-fitness clause into the corporate bylaws after Clara died. If I am medically declared psychologically incompetent—suffering from hallucinations, paranoia, or severe psychiatric distress—my voting shares don't go to probate. They automatically transfer to the executive oversight board, with full power of attorney granted to the Chief Technology Director."

Marcus’s jaw dropped. "Alistair Finch."

"Finch didn't just want my money," Julian said, the puzzle pieces slamming together in his mind with terrifying precision. "He wanted my patents. My neural-acoustic defense algorithms. The Pentagon rejected his research because it violated human rights treaties on psychological warfare. But if he takes over M.E.S. through the board, he gets access to my proprietary neural-mesh blueprints. He’s trying to drive me insane. He wanted me to call the police and tell them my dead wife was screaming through the walls and that invisible sounds were hurting my babies. In forty-eight hours, the board would have had me institutionalized, and Finch would have walked away with the keys to the kingdom."

"Then Finch is nearby," Marcus said, his eyes narrowing. "A signal like this requires a local master transmitter within five hundred meters to coordinate the localized ultrasonic nodes."

Sophie suddenly lifted her head from Elena’s shoulder. She sniffed, pointing a small finger toward the heavy steel door at the end of the corridor—the entrance to the master server room.

"The buzzing is loud in the box room, Mr. Julian," she said softly. "The angry hornets are inside the computers."

Julian shared a chilling look with Marcus.

The server room was supposed to be the most secure room in the mansion—fireproof, waterproof, shielded with a full copper Faraday cage to block any external electromagnetic interference.