The champagne flute shattered against the imported Italian marble, sending a spray of cold liquid and razor-sharp crystal across my black uniform shoes.

The utility service crawlway was narrow, choked with exposed plumbing pipes, electrical conduits, and decades of gray dust.

I crawled through the tight space on my hands and knees, my elbows scraping against the rough concrete wall. Behind me, Marcus followed, his large frame barely fitting through the tight metal framework.

Every breath tasted of cold mortar and old insulation. But I didn't care about the claustrophobia or the dirt ruining my clothes. All I could see was Leo's pale face from the ballroom, and Chloe's small fingers holding onto my hoodie.

They had trusted me. They had looked at me when the world was falling apart, and I had promised to keep them safe.

We reached a rusty iron vent grate overlooking the sub-basement east utility corridor.

I peered through the metal slats.

The corridor below was lit by harsh halogen work lights. At the far end stood the massive, circular steel door of the nuclear bunker.

Eleanor was standing near the control panel, wearing a heavy winter coat, holding a leather duffel bag over her shoulder. She looked anxious, her foot tapping rapidly against the floorboards.

Beside her, Vance was typing a complex, sixteen-digit code into the digital keypad mounted on the vault wall.

And sitting on a wooden bench near the door were Leo and Chloe. They were wrapped in heavy blankets, looking confused and terrified.

"Where is Daddy?" Leo was asking, his voice echoing faintly up through the ventilation shaft. "You said Daddy was waiting for us inside!"

"Your father is dealing with the police, Leo," Eleanor snapped, not looking at him. "Now sit still and stop asking stupid questions."

"I don't want to go in there," Chloe whimpered, tears spilling down her cheeks. "It's dark. I want Sarah!"

Eleanor turned around violently, stepping right up to the five-year-old girl. She raised her hand, her face contorted with pure, unfiltered rage. "If you say that maid's name one more time, Chloe, I swear to God I will leave you in that room by yourself!"

Above in the vent, Marcus shifted his weight, his grip tightening on his handgun until his knuckles turned white. I placed a reassuring hand on his shoulder, keeping him grounded.

"Wait for my signal," I whispered in his ear. "The control panel has a secondary breaker box right below our grate. If I hit the main junction with a round, the vault door will auto-engage its security lock down, trapping Vance on the outside."

"And Eleanor?" Marcus whispered back.

"Leave Eleanor to me," I said.

Vance finished entering the code. The heavy steel vault door gave a loud, pneumatic hiss, the multi-ton locking bolts sliding back with a deep metallic clunk.

"Get them inside," Vance ordered two of his remaining guards. "Once they're in, we initiate the air-seal delay. It gives us forty-five minutes to reach the helicopter before the system flags an error at central headquarters."

"Move, kids," the guard said, reaching for Leo's shoulder.

"Now!" I screamed.

I fired two rapid shots straight through the iron vent grate.

The heavy lead bullets slammed directly into the yellow main junction box mounted below the grate. High-voltage sparks erupted in a blinding shower of white light, accompanied by an deafening electrical explosion.

The digital control panel died instantly.

The massive steel vault door, responding to its automated safety override, slammed shut with a thunderous BOOM, the heavy locking bolts shooting back into place and sealing the bunker shut from the outside.

Leo and Chloe were locked inside—safe, untouched, and completely sealed away from Vance and Eleanor.

"What the hell?!" Vance yelled, spinning around, his tactical sidearm raised toward the ceiling.

Marcus smashed through the rusty iron grate, dropping eight feet down into the corridor like an avalanche of fury, landing heavily on the lead guard and driving him into the concrete floor.

I dropped down right behind him, rolling as I hit the floorboards, coming up with my weapon aimed straight at Eleanor.

"Drop the bag, Eleanor!" I shouted.

Eleanor shrieked in terror, dropping the leather duffel bag as she backed up against the sealed bunker door.

Vance swung his weapon toward Marcus, but Marcus was already upon him. Marcus grabbed Vance's wrist, twisting it violently to the side as a shot discharged harmlessly into the concrete ceiling.

The two men crashed into the wall, trading brutal, heavy punches in the cramped space. Vance was younger and tactical, but Marcus was driven by the terrifying, primal rage of a father fighting for his children's survival.

The second guard tried to raise his rifle toward Marcus's back.

"Don't do it!" I screamed, stepping into his line of sight, my sight aligned right between his eyes. "Put it down!"

The guard looked at my eyes—unblinking, cold, and entirely deadly—and slowly lowered his weapon, dropping it to the floor and raising his hands.

Behind him, Marcus delivered a devastating right hook straight to Vance's jaw. Vance’s head snapped back, his eyes rolling into his head as he collapsed unconscious onto the concrete floor.

Silence returned to the corridor, broken only by the heavy, ragged breathing of Marcus Sterling.

Eleanor sank to her knees against the bunker door, clutching her hands together, looking up at us with absolute, pathetic terror.

"Marcus... please," she sobbed, her mask entirely shattered. "He forced me... Vance forced me to do it! He threatened to kill me if I didn't help him!"

Marcus didn't even look at her. He walked past her as if she were made of air, stepping up to the manual emergency radio mounted beside the vault door.

He picked up the receiver. "Leo? Chloe? Can you hear me?"

From the speaker built into the wall, Leo’s voice came through, high and clear. "Daddy? Is Sarah there?"