Maya had been the nurse everyone overlooked for fourteen months—until a dying young woman arrived with a 90-pound military K9 guarding her like a weapon, and Maya whispered two classified words that made the animal obey instantly.

Mercer’s reaction was instantaneous.

He didn't look. He didn't ask questions. He threw himself sideways behind the heavy steel casing of a secondary boiler as Maya’s first three-round burst stitched across the metal where his head had been a quarter-second before.

*"Contact! Contact left!"* the mercenary at the switchboard screamed, swinging his carbine toward the tanks.

Maya didn't stay to trade fire. She was already moving.

She fired two rounds into the high-pressure relief valve of the primary liquid nitrogen tank twenty feet above them.

The heavy brass valve sheared off with a deafening, shrieking hiss.

Three hundred liters of liquid nitrogen, stored at minus three hundred and twenty degrees Fahrenheit, erupted from the ruptured tank in an expanding, hyper-dense cloud of white, freezing vapor. The temperature in the sub-basement plummeted sixty degrees in three seconds.

The cloud rolled across the concrete floor like an avalanche, swallowing the mercenary at the switchboard.

The man shrieked as the sub-zero fog hit his exposed face, flash-freezing his corneas and crystallizing his skin. His weapon dropped to the floor, shattering like brittle glass as the freezing gas contracted the metal receivers.

*"Ranger, pak hem!"* Maya barked.

The Belgian Malinois burst through the freezing white fog like a phantom. He struck the blinded mercenary at waist height, driving him backward into the spinning drive belt of the auxiliary water pump. The man went down with a sickening crack, silenced instantly.

"Fire through the fog!" Mercer roared from behind the boiler. "Sweep the perimeter! Cut her down!"

The remaining two mercenaries opened fire, their suppressed weapons spitting long, ragged bursts of 5.56 rounds through the nitrogen cloud. Concrete chips rained down from the ceiling; sparks showered over the diesel generators as copper-jacketed lead tore through the electrical housing.

Maya was already behind them.

She had circled through the maintenance crawlway, moving beneath the raised steel grating of the floor. She emerged five feet behind the third mercenary, who was leaning over a steel rail, firing blindly into the white mist.

Maya didn't use the gun. Gunfire would alert Mercer to her exact flank.

She drew her eight-inch surgical trocar—a thick, triangular-pointed steel instrument used to puncture chest walls for emergency trauma drainage.

She drove the point up and under the rear lip of the mercenary’s ballistic helmet, entering the foramen magnum at the base of the skull.

The man’s body stiffened instantly, his nervous system disconnected from his brain in a microsecond. He collapsed without a sound, his weapon slipping into Maya’s waiting left hand.

"That’s three, Jack," Maya’s voice drifted through the cold fog, echoing off the concrete walls from three different directions at once. "You’re running out of payroll."

Mercer stepped out from behind the boiler, his SIG Spear raised to his shoulder. His eyes were wide, scanning the shifting clouds of white vapor. His breath plumed in heavy, freezing clouds before his face.

"Callahan?" Mercer’s voice had lost its smooth executive polish. There was a jagged, terrified edge beneath the tone now. "Maya Callahan? You were dead. We confirmed your file at Landstuhl. The medical board signed off on the catastrophic brain trauma."

"The medical board worked for Vance, you idiot," Maya’s voice answered from the dark. "You spent five years hunting ghost files in Virginia while I was twelve miles down the road from your distribution terminal, changing bed linens."

Mercer fired a controlled pair into the darkness toward the sound of her voice. The rounds ricocheted off a steel pipe with a high, whining scream.

"You can't protect them, Maya!" Mercer shouted, backing toward the main emergency breaker panel. "The Carlyle group is bigger than you! We own the procurement board! We own the state attorney! If Isla Cross walks out of this hospital, she won't live to reach the federal courthouse!"

"She won't have to," Maya said.

A shadow detached itself from the ceiling pipe overhead.

Maya dropped straight down onto Mercer’s shoulders, her boots driving into his chest. They crashed into the concrete floor together, sliding five yards across the frost-covered linoleum.

Mercer’s rifle went flying. He rolled instantly, pulling a combat knife from his chest rig, slashing wildly in an upward arc.

The steel blade sliced through Maya’s scrub top, scoring a shallow, burning line across her left ribs.

Maya didn't flinch. Pain was just clinical feedback.

She trapped Mercer’s right wrist with both hands, twisted her hips, and executed a brutal, textbook kimura shoulder lock.

*CRUNCH.*

Mercer roared in agony as his right humerus snapped like a dry pine branch, his knife dropping to the floor.

Maya didn't release the pressure. She rolled on top of him, driving her knee into his sternum, her left forearm barring his throat, cutting off his carotid circulation.

Mercer thrashed beneath her, his face turning dark purple, his one working hand clawing weakly at the ceramic plate of her vest.

"The timer..." Mercer choked out, his blood-flecked lips pulling back into a grotesque grin. "The C4 on the generator... forty seconds... we all burn..."

Maya glanced at the switchboard. The red digital display on the C4 block was blinking: *00:38... 00:37... 00:36...*

She looked down at Mercer. Her eyes were completely calm.

"You should have checked my surgical rotation, Jack," she whispered. "I was the lead trauma specialist on the ordnance disposal unit."

Maya released his throat, grabbed his broken arm, and dragged him three feet toward the ruptured nitrogen pipe. She pulled his zip-ties from his own vest and bound his working hand to the high-pressure steel valve.

She stepped to the C4 block.

*00:24... 00:23...*

She didn't try to cut the wires. Cutting wires was for movies.

Maya grabbed the blasting cap assembly—the small, aluminum detonator tube inserted into the plastic explosive block—and yanked it clean out of the C4 with one violent, twisting pull.

She threw the detonator ten yards into the open, empty steel tank of the emergency cooling sump.

*BANG.*

The small blasting cap exploded with the force of a firecracker, echoing harmlessly inside the steel drum.

The block of C4 remained inert, harmless gray putty on the face of the transformer.

Maya walked back to Mercer, who was slumped against the valve, shivering violently in the sub-zero nitrogen fog, his breath shallow, his eyes wide with shattered disbelief.

She picked up the primary power lever on the main generator panel.