THE SOUND OF THE MONITOR: I locked myself in the bathroom with my newborn while my husband and his mother stood on the other side of the door.

The fog hung three feet above the surface of Lake Wallenpaupack like dirty cotton batting.

It was six-fifteen in the morning. The air coming off the water carried the sharp, mineral smell of wet slate and decaying pine needles. Deputy Vance’s personal four-wheel-drive truck sat hidden behind a stand of hemlocks half a mile up the access road, its engine cooling with dull, rhythmic clicks in the cold dawn.

I sat in the back seat with Toby strapped securely into his seat, my arms wrapped around the plastic shell of the carrier. My cracked collarbone throbbed with every breath, but the pain felt distant now, like something happening to someone else. The only thing that existed was the cold mist outside the window and the square of cardboard tucked inside my coat pocket.

Rachel Cole turned around from the front passenger seat, holding a laminated county surveyor’s map from nineteen-ninety-four.

"The spillway was reconstructed in ninety-six after the collapse," Rachel said, her pencil tracing a curved line along the northern shore. "The state contractor replaced four concrete piers with poured-in-place caissons. But the third pier—the one at the old powerhouse intake—was never demolished. The engineering firm claimed it was too close to the bedrock fault line to blast out with dynamite. They simply poured twelve inches of cap concrete over the top and paved the access walkway right over it."

"Arthur worked on that pour," Deputy Vance said from the driver's seat. He was wearing an old brown hunting jacket over his uniform shirt, his service weapon holstered at his hip under the canvas. "He was the inspector on site for three weeks straight during the freeze. He lived in a trailer by the gate."

"And Thomas Miller’s truck was found three miles south of here," Rachel added, looking up from the map. "Empty. With his wallet on the dashboard and the keys in the ignition. The state police assumed he walked into the woods and drowned himself in the reservoir."

"He didn't walk anywhere," Vance said grimly. "He was already in the mix."

A sudden sound cut through the silence of the woods: the low, steady rumble of a heavy diesel engine coming down the gravel road behind us.

Vance reached down and clicked the ignition off, dropping his hand to his side. "Nobody move."

Through the frosted rear window, I saw the dark shape of a black Lincoln Navigator rolling slowly through the hemlocks. It didn't have emergency lights or county seals on the doors. But I recognized the gold dealer frame around the license plate: Miller & Cross, Attorneys at Law.

The SUV didn't stop at the boat launch. It turned onto the narrow service path that led directly out onto the concrete crest of the spillway—a road closed to the public by a locked steel gate.

The gate was already swinging open, its heavy padlock hanging loose from the chain.

"Robert," Vance muttered. "He didn't go to the courthouse. He came straight here."

"Why would he come here?" I asked, my heart leaping into my throat as Toby made a small, questioning noise in his sleep. "If the body has been under that concrete for thirty years, why would he come here this morning?"

"Because the state audit isn't about taxes, Sarah," Rachel said, her eyes fixed on the retreating taillights of the Lincoln. "The auditor from Harrisburg arrived with ground-penetrating radar equipment to survey the spillway footings for the thirty-year relicensing review. If that radar team hits the third pier at ten o'clock this morning, they won't find low-grade rebar. They’ll find an iron tool chest with human remains inside."

"He's going to destroy it," Vance said.

He shifted the truck into drive, released the emergency brake without letting the ratchet click, and let the vehicle roll down the incline under its own weight, keeping the headlights completely dark.

The road ended at the base of the old powerhouse intake.

Ahead of us, the concrete wall of the spillway stretched out into the gray water like the prow of a battleship. The Lincoln sat idling at the end of the walkway, its halogen headlights cutting through the fog, illuminating a small, square section of the concrete where a heavy core-drilling rig was mounted on the back of a utility trailer.

Two figures stood by the drilling rig.

One was tall and thin, wearing a long cashmere overcoat that fluttered in the lake wind: Robert Miller.

The other was shorter, wrapped in a heavy sheepskin jacket with the collar turned up against the cold. As the headlights of the drill rig flickered on, the yellow light caught the side of her face, illuminating the sharp, elegant cheekbones and the silver-gray hair pinned beneath a woolen beret.

Evelyn.

She hadn't stayed at the house. She hadn't waited for her son's bail hearing. She was standing on the concrete pier with a four-inch gas-powered industrial saw in her gloved hands, watching the drill bit bite into the gray surface of the stone with a high, screaming whine that tore through the morning silence like a circular saw hitting iron.

"They aren't drilling it out," Vance breathed, his hand gripping the steering wheel until his knuckles turned white. "They're pouring quick-setting hydraulic acid into the intake shafts. They're going to dissolve whatever is left in that chamber before the state team arrives with the sensors."

"We can't stop them with just three of us," Rachel said, her hand reaching for her phone. "There’s no cell service down in this basin. We need the state police."

"We don't have twenty minutes for the state police," Vance said. He kicked his door open and stepped out onto the gravel, unholstering his Glock with a single, practiced motion. "Sarah, stay in the cab. Lock the doors."

"No," I said.

I didn't think. I didn't hesitate. I unbuckled Toby from his seat, tucked him against my chest under the heavy wool sweater, and stepped out into the freezing lake air. My knees were steady. The trembling in my fingers had vanished.

"Sarah!" Rachel hissed, reaching for my arm from the open door. "Get back inside!"