"We don't leave witnesses who know the barcode numbers," Miller replied. "His kid made the same mistake on Route 12. Let's finish the sweep."
The radio clicked off.
Miller reached down, unclasped the snap holster on his hip, and drew his service weapon. He didn't rush. He racked the slide once with a practiced, heavy snap, checking the brass rim of the chambered round under the glare of the sodium lights, then turned toward the iron stairs leading up to my catwalk.
I pulled back from the railing, my boots scraping silent against the corrugated iron.
Running back toward holding room six was impossible. The transport deputy would already be at the exterior desk, Vance would be waiting with a fabricated medical transfer form, and any door back into the public terminal was sealed behind magnetic security locks.
There was only one direction with an open drain line: the high-pressure steam bypass fifty yards further down the tunnel, where the municipal water plant tied directly into the airport's sub-grade boiler circuit.
I reached into my back pocket and gripped the solid brass calibration wrench.
To an airport police officer, an underground fuel vault was a private smuggling lane hidden from security cameras. To a boiler maintenance technician who had spent thirty years mapping every shutoff valve and pressure regulator between South Bend and the county line, it was an interconnected hydraulic system running at eighty pounds per square inch.
I turned away from the stairs, slipped into the narrow shadow between the twin insulated pipes, and moved toward the main pressure regulator.
CHAPTER 3: The Valve That Broke Their Hold
The cast-iron bypass wheel of the secondary steam main resisted under my palms, its threads seized by years of mineral crust and dry heat.
I hooked the curved jaw of the brass calibration wrench around the outer spoke, braced my right heel against the floor-mount anchor bolt, and heaved upward with my legs. The rust gave way with a muffled, metal groan. Hot vapor hissed through the gland packing, venting into the concrete chase in a rising white plume that carried the sharp stench of scale and boiled copper.
Beneath my boots, the pressure gauge needle jumped from sixty pounds to ninety-two.
Down in the transfer vault, the primary booster pump shrieked as the sudden pressure imbalance tripped its mechanical safety governor. The steady, heavy hum that had masked Miller’s boots across the concrete died into an erratic shudder. The sodium lamps overhead flickered once, dimmed by the surge of the auxiliary generator trying to absorb the load.
"Miller!" Vance’s voice cut through the static on the officer’s chest radio, echoing up through the grating. "The sub-grade alarm just lit up the board in dispatch. Sector three fuel pressure dropped twelve percent. What are you doing down there?"
Miller didn't answer through the radio.
Below me, the officer froze beside the open rear bumper of the gray utility van. His drawn duty weapon stayed level at his hip, but his head jerked up toward the ceiling chase where the white vapor was beginning to roll across the steel girders. He took two fast, cautious steps toward the access ladder, the rubber soles of his tactical boots squeaking against the wet concrete apron.
"Ross!" Miller called out. The calm, hollow cadence was entirely gone, stripped down to a harsh rasp. "Step out to the rail. You don't know what you're turning down here. You rupture that auxiliary line, you take the entire baggage transfer hall with it."
"I know exactly what this line feeds," I shouted back, leaning my weight against the iron wheel to hold the bypass open another quarter-turn. The heat bit through the damp canvas of my jacket sleeves, scalding my forearms, but I kept my grip. "It doesn't feed the terminal heating plant. You routed this loop around the customs quarantine bays six months ago. Leo logged every foot of the welded sleeve on his graveyard shift."
Miller paused at the bottom rung of the catwalk ladder. His eyes scanned the steam-filled rafters, searching for my silhouette behind the pipes.
"Your boy didn't know what he was looking at," Miller said, taking the first rung, his gun hand rising to cover the catwalk platform above him. "He was a grease monkey who couldn't keep his mouth shut. He found a manifest he shouldn't have touched, and he tried to leverage it into a transfer to the city division."
"He didn't leverage anything," I said.