Chapter 1 - THE KNOCKING IN THE HALLWAY

Frank Mercer woke because someone was knocking.
Not at the front door.
Not loud enough for a neighbor to hear.
It was a small, weak tapping somewhere inside the house.
He sat up in the guest bedroom, heart already moving faster than his body. At seventy-two, Frank had learned that fear arrived before explanation. Especially in a house with children.
The hallway outside was dim, lit only by the warm kitchen light left on over the sink. The hardwood floor felt cold under his bare feet as he stepped out.
Then he saw Lily.
His eight-year-old granddaughter was on the hallway floor beside the white closet door, curled partly on the narrow rug in her pink pajamas. Her cheeks were flushed, her hair stuck to her forehead, and one hand was pressed weakly against the floor as if she had tried to crawl.
“Lily?”
Frank dropped beside her.
Her eyes opened halfway.
“Grandpa…”
Another knock came from inside the closet.
Frank turned toward the door.
Lily’s voice came out faint and broken.
“Mason’s locked in there.”
For one second, Frank couldn’t understand the words.
Mason was ten. Mason was careful. Mason hated the dark. Mason never closed himself in closets, not even playing hide-and-seek.
Frank grabbed his phone from his pajama pocket and dialed emergency services with one shaking thumb.
“My granddaughter is barely awake,” he said, forcing himself to speak clearly, “and my grandson is locked in a closet.”
The dispatcher began asking questions.
Address.
Age.
Breathing.
Consciousness.
Was the door blocked?
Was anyone else in the house?
Frank kept one hand near Lily without moving her roughly.
“Stay with me, sweetheart.”
From inside the closet came a muffled sob.
“Grandpa, don’t leave us.”
“I’m right here, Mason.”
Frank reached toward the closet knob.
Lily’s hand shot out and caught his sleeve.
It was barely a grip.
But it stopped him.
“Don’t open it yet,” she whispered.
Frank froze.
The dispatcher’s voice sharpened in his ear.
“Sir, what did the child say?”
Frank stared at the closed closet door.
“Lily, why not?”
She shook her head, eyes wide with terror.
Frank swallowed.
Then leaned closer to the door.
“Mason,” he said low, “who locked you in there?”
Silence.
Long enough that Frank heard the old radiator tick in the kitchen.
Long enough that he heard Lily’s shallow breathing.
Long enough that every shadow in the hallway seemed to move.
Then the closet knob slowly turned from the inside.
Mason’s voice came through the door in a trembling whisper.
“Grandpa… he’s still in the house.”
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A floorboard creaked somewhere behind Frank.
And the old man who had thought he was spending one quiet night babysitting his grandchildren realized he was not alone.