I’ve survived mortar fire in Helmand Province.

Steel met chain with a deafening, metallic shriek.

The rusted padlock exploded into fragments, the chain-link fence peeled back like tin foil, and the old Ford plunged off the highway into the absolute blackness of the gravel quarry.

The transition from smooth asphalt to loose, uncompacted shale was instantaneous. The steering wheel jerked violently in my hands as the four mud-terrain tires bit into the aggregate, spraying a twin rooster tail of gray gravel fifty feet behind us.

The quarry was a massive, tiered scar carved into the side of the mountain—three miles of descending terraces, abandoned conveyor belts, rusted sorting screens, and colossal piles of crushed limestone that cast jagged, mountainous shadows under the pale moon.

Behind us, the blinding light bars of the Dodge roared through the ruined gate, followed by the surviving three motorcycles. They were howling in on our trail like wolves entering a box canyon.

They thought they had me cornered. They thought I had panicked and driven into a dead end.

They didn't understand terrain analysis.

When you spend five years reading topographical maps under red lens flashlights in the Hindu Kush, you see geography differently. A civilian sees a pit. A soldier sees chokepoints, high ground, dead space, and fields of fire.

I killed my headlights.

The world went pitch-black.

To a man driving on instinct, turning off your lights at fifty miles an hour on loose gravel is suicide. But my eyes had already adapted to the gloom, and Rex’s low, directional grunts told me where the air currents were hitting the sheer rock walls.

I whipped the wheel hard to the right, sliding the truck behind the towering skeleton of an abandoned gravel-washing plant—a four-story monolith of rusted iron girders and corrugated steel roofs.

I hit the brakes, cut the ignition, and pulled the emergency brake.

The massive diesel engine shuddered to a halt. The only sound was the ticking of the hot exhaust manifold and the steady, rhythmic drumming of my own heartbeat.

"Out, Rex," I whispered, barely moving my lips.

I pushed the driver’s door open just enough to slide through, avoiding the metallic click of the latch. Rex slipped through the gap like smoke, his black-and-tan coat melting into the shadows of the machinery.

I reached behind the bench seat and pulled out my primary defense tool. Not an assault rifle. Not a military carbine. Just an old Remington 870 Wingmaster twelve-gauge shotgun with a weathered walnut stock—a bird gun my grandfather had given me when I turned sixteen. It held four rounds of standard double-ought buckshot in the tubular magazine.

Four rounds. Five hostiles.

The math was acceptable.

A hundred yards away, the headlights of the Dodge swept across the gravel flats, illuminating the dust cloud we had kicked up. The three motorcycles peeled off in a fan formation, their engines echoing off the sheer rock faces of the quarry walls.

"Find him!" Sheriff Vance’s voice echoed through the dark, carrying the raw, gravelly authority of a man who had ruled this county like a feudal lord for twenty years. "Check the conveyors! If the dog moves, shoot it! If the boy moves, put two in his legs—I want him awake when we throw him in the slurry pit!"

"Over here, Sheriff!" one of the bikers shouted, his voice coming from thirty yards to my left, near the base of an old aggregate hopper. "The truck’s behind the wash plant! The engine’s still hot!"

I didn't move. I was pressed flat against the cold, grease-caked steel of a support girder, eight feet above the ground on an access cat-walk. Rex was tucked beneath the conveyor belt below me, completely invisible, invisible even to my night-adjusted vision.

The biker approached the driver’s side of my truck, his revolver held in both hands, kicking the driver's door open with his boot.

"Empty!" he yelled.

He was standing directly under my catwalk.

I didn't waste a shell.

I stepped off the iron grating, dropping eight feet straight down through the darkness.

My boots struck the center of his shoulders with bone-crushing momentum. The impact drove him face-first into the crushed shale with the sound of a sack of wet flour hitting concrete. His revolver flew from his hand, spinning into the dark.

Before he could draw breath to scream, the heel of my boot caught the base of his skull.

He went limp.

One down.

The clatter of his fall brought the second biker running around the corner of the conveyor, his tactical flashlight cutting through the dust.

"Tommy? That you?"

The beam of his flashlight hit his unconscious partner sprawled in the dirt. Before his brain could process the visual data, I gave the command.

"Rex. Take."

A whisper. Barely louder than a rustle of dry leaves.

From the black void beneath the conveyor, a ninety-pound streak of fur and fangs launched itself into the light. Rex didn't bark. He struck the biker at the waist, driving him backward into a mountain of pea gravel. The titanium canine sank deep into the meat of the man's forearm, the bone grinding beneath the pressure.

The biker’s scream tore through the quarry like a siren.

BANG.

A shot rang out from the far side of the sorting plant. A high-caliber rifle round struck the steel girder four inches above my head, spraying a shower of rust into my hair.

"There he is!" Vance roared.

The Sheriff was standing on the bed of his Dodge, fifty yards away, holding a scoped bolt-action hunting rifle—a .30-06. The heavy hunting round was designed to drop an elk at four hundred yards. If it hit my chest, it would punch a hole through my spine the size of a coffee mug.

"Rex, return!" I barked.

Rex released the screaming biker and bounded back toward my position, weaving through the labyrinth of conveyor supports with serpentine agility.

BANG.

A second round tore through the sheet metal of the wash plant, ripping a jagged hole through the corrugated iron right where Rex had been standing a fraction of a second earlier.

The third biker was advancing from the right, using a stack of heavy earthmover tires for cover, armed with a short-barreled pump gun.

I racked the slide of the Remington.

CH-CHICK.

The sound of a twelve-gauge racking is an international language. It transcends dialect, culture, and training. It means death is six feet away and closing.

The third biker froze behind the tires. He peeked his head out, his shotgun barrel leading his eyes.

I didn't aim for his head. I aimed for the gravel at his feet.

I pulled the trigger.

BOOM.

The shotgun roared, lighting up the rusty interior of the plant in a brilliant, violent flash of orange flame. Nine heavy lead pellets struck the loose aggregate six feet in front of the tires, turning the shale into a claymore mine of supersonic rock fragments.

The ricochets shredded his jeans and embedded themselves in his shins.

He dropped with a shriek of agony, dropping his weapon and clutching his bloodied legs as he rolled in the dirt.

Two rounds left.

Sheriff Vance fired again from the truck bed, the .30-06 slug punching through the radiator of my F-250 with a loud, hissing hiss of escaping coolant.

"You're out of shells, boy!" Vance screamed, his voice cracking with manic fury. "I know that gun! It’s a four-shot tube! You fired one at the gate and one at my boy! You're done! Come out with your hands up or I swear to God I'll burn this whole plant down with you inside it!"

He was wrong about the math. I hadn't fired at the gate; I had rammed it with my bumper.