The Mastiff with the Brass Warning

“You believe those little quakes we’ve felt all summer came from nature?” Mark asked. His voice shook on the last word. “The diner’s foundation didn’t split because the weather got hot. Apex-Bio set off micro-seismic charges. They were mapping what lay below us.”

I kept my hand close to the shotgun’s trigger guard. Lowering it wasn’t an option. “Mapping what?”

“The void.” Mark spoke quietly, eyes stretched wide with a fear that had nothing to do with the weapon in my hands. “Apex-Bio wasn’t after gravel. Two years back, their geological satellites picked up something strange: a huge cavern network, sealed away from the surface. It runs below the county. The rock is thinnest beneath your barn.”

My thoughts scrambled to keep pace with him. I’d retired to a quiet patch of land, cheap and unwanted, the sort of place nobody could make much use of. That was what I’d believed I was buying.

“That iron grate in the barn floor,” I said. Understanding struck hard. “It’s the ventilation shaft from the old quarry. The one they built in the seventies. It drops into the bedrock.”

Mark nodded rapidly. One trembling finger jabbed toward the map. “That’s it. They drilled from the compound across the creek. The big machines you heard were for that. They ran into solid igneous rock. The old shaft was their only practical way in.”

“So they tried to buy my land.”

“Through shell companies. They made offers, but you kept telling the agents no.”

I thought of those pushy calls the year before, and the ridiculous piles of cash they’d dangled for twenty acres of rocky ground. I’d sent them packing. I wanted my privacy.

“Then they put you next door to watch me,” I said. The betrayal sat hot in my chest. “That was the plan?”

“I’m only a site manager, Elias.” Mark raised both hands as if that might make me believe him. “I had to track your routine and learn when you’d be away. They wanted a quiet team to get through the grate.”

He faltered, then glanced toward the curtained windows. Whatever might be out there had him more frightened than the shotgun did.

“A month ago, the drilling crew finally opened a narrow crack in the cavern roof,” he continued. “Just enough to reach the space below.”

“And then?” I asked.

Mark swallowed. “They sent probes down. The air is poison. Heavy gases, old biological particles. A person couldn’t make the descent, not even inside a hazmat suit. The pressure and toxins destroyed the protective seals.”

The dread in my gut grew heavier. Every piece I’d been trying to ignore snapped into place with a sound I could almost feel.

“The mastiff,” I said. My voice came out thin against the refrigerator’s steady hum.

“Asset 04,” Mark answered. “Apex-Bio’s genetics people designed him for it. Stronger bones to take the pressure. An immune system made to filter the gases. He was built to enter that cavern and bring back whatever biological samples are still alive down there.”

I saw the clinic’s metal table in my mind. The barcode. That strange amber glint in his eyes. The way the wound from the rattlesnake had closed with impossible speed.

He wasn’t just a dog they’d made tougher. They’d turned a living creature into a vehicle for going somewhere no human could survive.

Then a small metal sound came from the porch.

A carabiner, maybe, striking the aluminum rail. It barely carried through the room, but the afternoon had gone so quiet that I heard it clearly.

Mark stopped moving. What little color remained in his face drained away. “They’re here.”

The front windows burst inward before I could bring the shotgun up.

Dark canisters sailed through the broken frames and clattered over the cheap laminate. A thick gray cloud began pouring out of them, sharp and biting in the back of my throat.

Tear gas. They weren’t here to knock and talk.

“Back door!” I shouted. I seized Mark by his hunting jacket and shoved him toward the cramped kitchen.

He staggered ahead of me. A red laser point appeared through the smoke and settled on the middle of his chest.

Something suppressed cracked three times outside.

Thwip. Thwip. Thwip.

Three beanbag rounds struck Mark square in the torso, non-lethal shots that hit with the brutal force of a hammer. The impacts knocked him backward across the kitchen table. Its map ripped beneath him as he landed on the floor, groaning and still.

“Mark!” I cried, dropping beside him. The gas stung my eyes and clawed at my lungs, and every breath made it worse.

Boots hammered over the front porch boards. Whoever was out there moved in close coordination, without a word wasted. No sirens, no warnings. Just the chilling precision of an Apex-Bio retrieval crew.

I had seconds before they came through the door.

Mark was too heavy to haul, and the hallway would put me straight in their line of fire. I couldn’t get him out that way.

I turned toward the kitchen floor beside the water heater and aimed at the flimsy plywood. The front door was about to give. The operatives were coming in, and I needed another way out.

I worked the shotgun’s action and fired. Its roar filled the tiny trailer, so loud it seemed to crush the air around me. Buckshot tore through the vinyl and blasted a ragged opening in the rotting boards, revealing the dark crawlspace beneath.