My mind struggled to make sense of the numbers.

“This can’t be right,” I whispered.

Madison leaned over my shoulder.

“That’s impossible.””

I turned to the next page.

It was another birth certificate.

This one listed a baby girl born in 1997.

The name was Eleanor Catherine Bennett.

The mother’s name was Catherine Bennett.

The father’s name was Richard Bennett.

But across the page, in red ink, someone had stamped the word VOID.

Beneath the stamp was a handwritten note.

Identity reassigned under emergency guardianship order.

I backed away from the safe.

“Madison, what does this mean?””

She looked terrified.

“I don’t know.””

I examined the remaining papers.

There were hospital admission forms, legal affidavits, and a notarized statement signed by Victoria. Several pages referred to a child identified only by the initials E.C.B.

Then I found the black ledger.

The first page listed payments made to Dr. Samuel Whitmore.

The second listed transfers to a company registered under my mother’s name.

The third contained a line that made my hands go numb.

October 14, 2009 — Identity transfer completed. Catherine secured. Richard informed that original child died. Replacement child accepted under revised documentation.

I read the sentence three times.

A replacement child.

Someone had replaced me.

Or someone had replaced the girl my father believed was me.

Madison began shaking her head.

“No. No, this can’t be real.””

I turned to her.

“Did Victoria ever tell you that you were adopted?””

She stared at me.

“What?””

“Did she ever tell you anything about your birth?””

“No.””

“Do you have a birth certificate?””

“Of course.””

“Have you ever seen the original?””

Madison’s silence answered me.

I returned to the safe and pulled out the velvet box.

Inside lay a small gold locket.

I recognized it immediately.

My mother had worn it in every photograph I remembered.

I opened it.

On one side was a picture of Catherine.

On the other was a photograph of two baby girls lying side by side in a hospital nursery.

Both had dark hair.

Both had tiny fists curled beneath their chins.

And beneath the photograph, my mother had engraved a date.

October 14, 2009.

I couldn’t breathe.

Two baby girls.

Two identities.

One dead daughter.

One replacement.

Behind the photograph was a folded note.

If you are reading this, they have told you that one of my daughters died. Do not believe them. I gave birth to twins. Richard was never told the truth about what happened to the first child.

My knees nearly buckled.

Twins.

I had a sister.

A sister who might have been living in my house all along.

I turned toward Madison.

She was staring at the photograph with a strange, hollow expression.

“Madison?””

She didn’t answer.

I stepped closer.

“Madison, look at me.””

She lifted her eyes.

And for the first time, I noticed the crescent-shaped scar beneath her left eyebrow.

The same scar I had.

My breath caught.

She touched her forehead instinctively.

“What?””

I raised my hand to my own scar.

Then I looked back at the photograph.

Two babies.

Two identical faces.

Two girls who had grown up under different names, believing different stories about the same mother.

“Madison,” I whispered, “when is your birthday?””

She stared at me.

“October fourteenth.””

“What year?””

“Two thousand nine.””

The room seemed to disappear around us.

She backed away from me, shaking her head.

“No. My birth certificate says I was born in 2000.””

“Then someone changed your records.””

“My mother told me she gave birth to me at home!””

“Victoria isn’t your biological mother.””

Madison’s face crumpled.

I wanted to reach for her, but neither of us moved.

We had spent seventeen years fighting over a family that had been built on a lie.

I had believed she was my spoiled stepsister.

She had believed I was the unwanted daughter of her father.

But the photograph suggested something far more terrible.

We were sisters.

Possibly twins.

And our mother might still be alive.

A floorboard creaked outside the library.

We froze.

The handle began to turn.

I shoved the papers into the envelope and pushed it beneath my sweater. Madison grabbed the locket.

The door swung open.

Victoria stood in the doorway wearing a silk robe, her hair perfectly arranged despite the hour.

Behind her was Dr. Samuel Whitmore.

He held a leather medical bag in one hand.

His face went white when he saw the open safe.

Victoria looked at the scattered papers on the desk.

Then she looked at Madison.

“Put the locket down,” she said.

Madison clutched it against her chest.

“Who am I?””

Victoria’s expression hardened.

“You are my daughter.””

“Then why does this say I was born to Catherine Bennett?””

For the first time, Victoria had no immediate answer.