Chapter 1 - The Hollow Wall

The air in the attic was thick enough to taste, a dry mixture of powdered mortar, bird droppings, and decades of stagnant heat.
Lily held her phone with both hands, the light cutting a yellow circle through the gloom. Dust motes swirled in the beam, so dense they looked like suspended sparks. To their right, two dormer windows were covered with heavy plywood nailed from the inside, but thin slivers of gray morning light managed to leak around the edges, striping the floorboards in gray and gold.
"Emma," Lily breathed, holding her camera against her chest with her chin. "Look at the floor."
Emma stepped around a broken wicker trunk, her eyes scanning the floorboards. "There’s no dust here."
A clean path ran across the center of the attic floor, leading straight toward the chimney stack that rose through the middle of the room. The rest of the attic was covered in a thick blanket of gray soot, but this narrow lane had been wiped clear, as if heavy sacks—or feet—had been dragged over it repeatedly.
The knocking came again.
It did not come from the ceiling or the floor. It came from inside the wall that flanked the chimney—a false plaster partition built flush with the red brickwork.
Tap. Tap. Tap.
Thump. Thump. Thump.
Tap. Tap. Tap.
"S.O.S.," Emma whispered, her voice dropping an octave. "It’s Morse code. Someone is in there."
Lily took two steps forward, her camera swinging against her ribs. She pressed her ear to the cool plaster. "Hello? Can you hear me?"
A wet, rattling cough answered her from behind the wall. It sounded terrifyingly close, less than three inches from her ear, separated only by thin lath and horsehair plaster.
"Water," the voice rasped. It was thin, paper-dry, the voice of a man whose throat had turned to dust. "The lock... on the right... of the mantle..."
Emma didn't hesitate now. The cautious, rule-following twin vanished the moment a clear problem presented itself. She grabbed a rusted crowbar that lay beside an open toolkit near the stairs—left behind by some long-ago carpenter—and moved toward the chimney.
"Show me where," Emma commanded.
"There," Lily said, pointing her phone light at a seam where the plaster met the dark red brick of the fireplace. "Look at the woodwork. That mantle isn't structural."
The mantle was carved dark oak, heavy and black with old varnish. On the right side, hidden behind a carved rosette of oak leaves, sat a small iron keyhole, nearly invisible under years of grime.
"It’s not locked," the voice behind the wall croaked. "The latch... lift the leaf..."
Emma jammed the flat end of the crowbar behind the carved oak leaf and leveraged her weight against it. Wood groaned. Paint cracked like dry glass. With a sharp snap, the leaf swung upward on a hidden brass hinge, revealing a heavy iron lever buried in the brickwork.
Lily leaned her shoulder against the lever and shoved down with all thirty-five pounds of her weight.
A heavy mechanical thunk echoed inside the wall, followed by the screech of ungreased iron hinges. A four-foot section of the plaster wall—disguised to look like part of the room's permanent structural framing—swung outward three inches.
A wave of icy, foul air poured out of the dark opening.
Lily shoved her phone flashlight through the gap.
The room behind the wall was narrow, no wider than a pantry, built into the dead space between the chimney and the roof eaves. There were no windows, no vents, and no furniture except for a frame of welded iron bolted directly into the floor.
Chained to that frame by his left ankle sat a man.
His clothes were rags—a fine wool suit jacket now shredded at the elbows, stained with grease and urine, draped over a chest so thin his ribs showed through his shirt like the rings of a wooden barrel. His beard was long, matted with gray dirt, and his skin had turned the greyish-white color of cellar sprouts that had grown without sunlight.
Beside him lay three empty plastic water jugs, a pile of yellowed newspapers from 2012, and a small, green leather-bound journal sitting in the dust.
He raised a claw-like hand to shield his eyes from Lily’s flashlight.
"The sun," he gasped, his cracked lips bleeding as he spoke. "Is it... is it still up?"
"Emma," Lily yelled, her voice breaking. "Call 911! Right now! Call them!"
Emma pulled her phone from her coat pocket, her thumb flying across the screen. She looked at the top corner, then held the phone higher, walking toward the dormer window.
"No signal," Emma said, her voice terrifyingly flat. "The iron roof sheeting is blocking it. We have to go down to the lawn."
The man in the wall reached out, his long, yellowed fingernails scraping against the floorboards toward Lily’s boots.
"No," he whispered, his voice cracking into a dry sob. "No police. If... if they see the police... he’ll kill me before you reach the gate."
Lily dropped to her knees beside him, uncapping her water bottle and holding it to his lips. He drank wildly, half of it spilling down his chin, soaking into his torn collar.
"Who?" Lily asked, holding the bottle steady with trembling hands. "Who will kill you?"
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The man swallowed, his chest heaving as the water hit his stomach. He looked up at the two girls with eyes that were terrifyingly lucid despite his starved frame.
"My brother," he said. "Arthur Vance. And he’s standing in the driveway right now."