The woman behind our hallway wall knew my son’s name.
That was the first thing that made no sense.
The second was my wife’s face.
“Owen…”
The woman’s voice was weak, almost swallowed by the darkness behind the wall.
My five-year-old son stopped smiling.
Thirty seconds earlier, he had been proud of himself.
He had been sitting on the hardwood floor with a box of crayons, drawing a rocket ship against the baseboard when he noticed a tiny brass circle beneath a flake of loose paint.
“Daddy, what’s this?”
I assumed it was an old screw.
Owen pressed it.
Something clicked inside the wall.
Then an entire section of paneling moved backward three inches.
I remember staring at it, unable to understand what I was seeing.
We had lived in that house outside Boston for almost four years.
I had renovated two bathrooms.
Replaced plumbing.
Opened part of the kitchen.
Run electrical cable through half the downstairs.
Nobody had ever mentioned a room behind that wall.
I pulled the panel farther open.
Cold air touched my face.
There was a narrow chamber on the other side.
Concrete walls.
A folding cot.
A battery lantern.
Water bottles.
A woman.
She was sitting on the floor with her knees pulled against her chest.
Maybe thirty-five.
Dark brown hair.
Bruises along one side of her face.
A bandage wrapped around her left hand.
Then she saw Owen standing behind me.
Her eyes widened.
“Owen…”
My son grabbed my shirt.
“Daddy, how does she know me?”
I turned toward my wife.
Natalie had just come through the front door.
Her handbag slipped from her shoulder.
She stared at the woman.
Her face went completely white.
And that was the exact moment I understood something that frightened me even more than finding a stranger inside our wall.
Natalie knew her.
“Owen,” I said, “go into the living room.”
“But Daddy—”
“Please.”
He looked at the woman once more.
Then at Natalie.
Finally, he walked away.
I waited until I heard the television.
Then I turned.
“Natalie.”
She didn't answer.
“Who is she?”
Natalie swallowed.
“Grant…”
The woman inside the chamber shook her head.
“Don't let him call anyone yet.”
I looked at her.
“You're injured and hiding inside my house. I'm calling the police.”
I reached for my phone.
Natalie grabbed my arm.
“Wait.”
I stared at her hand.
She released me immediately.
“What is going on?”
Natalie looked toward the living room.
Then she quietly closed the hallway door separating us from Owen.
The woman struggled to stand.
“My name is Mara Ellis.”
I had never heard it before.
“I used to work at St. Catherine's Medical Center.”
That name meant something.
Owen had been born there.
So had Natalie.
So had half the people in the county.
“What does that have to do with my son?”
Mara looked at Natalie.
Natalie whispered, “Tell him.”
Mara looked back at me.
“I was on duty the night Owen was born.”
The room seemed to shrink.
I stared at her.
“You were his nurse?”
“Not exactly.”
“What does that mean?”
“I worked in neonatal records.”
A terrible feeling began crawling up my spine.
“How do you know what he looks like now?”
Mara didn't answer.
I turned toward Natalie.
“How long has she been here?”