Dad, my brother is tapping from below,” my five-year-old daughter whispered in the new living room at my sister’s house; everyone said it was imagination, but I lifted the rug, grabbed an iron bar, and broke through the boards in front of my mother, not knowing that beneath that floor was the secret my family had hidden for 11 months.

“Dad, my brother is tapping from below,” my five-year-old daughter whispered in the new living room at my sister’s house; everyone said it was imagination, but I lifted the rug, grabbed an iron bar, and broke through the boards in front of my mother, not knowing that beneath that floor was the secret my family had hidden for 11 months.

—Dad… Mateo is crying under the floor.

Camila said it with a calmness that chilled me to the bone.

She didn’t shout.

She didn’t make up a monster.

She didn’t tug on my shirt like she did when she wanted water, or pull that fake scared face she used when she wanted me to turn off the hallway light.

She only knelt in the middle of my sister Verónica’s spotless living room, pressed her palm to the new wood floor, and repeated in a low voice:

—My brother is down there. He says he’s cold.

I froze.

Verónica’s new house was in a gated community in Querétaro, with freshly planted bougainvillea, cameras at the entrance, and a gate so clean it looked straight out of a magazine. It smelled like fresh paint, lemon cleaner, and capsule coffee. Everything gleamed: the large windows, the marble table, the white cushions nobody was supposed to touch.

Nothing in that house seemed capable of holding a tragedy.

And yet, my five-year-old daughter was hearing something beneath the floor.

My name is Andrés Salgado.

For 11 months, I was the father of a missing boy.

My son Mateo was 7 when he vanished from our patio in Guadalajara, one Sunday afternoon, while I took meat off the grill and my wife Mariana looked for plates in the kitchen. The back door was found open. His bicycle was still lying beside the lemon tree. His sneakers were covered in dirt. No one saw a car, no one heard a scream, no one remembered anything useful.

The report was filed at 7:42 in the evening.

The first search began before it was fully dark.

For days, police, neighbors, tracking dogs, and volunteers posted his photo on poles, in stores, and at bus stops. By the second week, reporters were already calling it “a cold case.” By the third month, people started lowering their voices when they saw me.

Camila was 3 when Mateo disappeared.

At first, she asked every day if her brother would come back to play lottery with her. Then she stopped asking. Everyone said that was better.

But I knew the truth.

Children don’t forget.

They just learn which questions break their parents.

That’s why I accepted Verónica’s invitation.

—Come for the weekend —she told me—. It’ll do Camila good to get a change of scenery. And you too, Andrés. You can’t keep living like a ghost.

Verónica was my older sister.

Always perfect.

Always put together.

Always ready with an answer.

When Mateo disappeared, she was the first to arrive with food, blankets, and sleeping pills. She hugged Mariana. She cried with me. She told my mother our family had to stay united.

Three months later, she moved to Querétaro.

She said she needed a fresh start.

She also said something that didn’t seem important then:

—I changed the whole floor. The old boards creaked terribly.

Now that sentence hit me like a stone.

Verónica came out of the kitchen with two cups of coffee. She was smiling, but when she saw Camila kneeling, the smile froze.

—What is the child doing?

I didn’t answer.

Camila moved her fingers over the seam between two boards.

—Mateo is tapping softly —she whispered—. He says he can’t open it.

The cup shook in Verónica’s hand.

A few drops of coffee fell onto the perfect floor.

—Camila is tired —my sister said too quickly—. Children say things.

I knelt beside my daughter.

—Camila, look at me.

She shook her head.

—If I speak loudly, he’ll get scared.

I felt my chest tighten.

I pressed my ear to the wood.

At first, I heard nothing.

Only the hum of the refrigerator.

A dog barking far away.

Verónica’s breathing behind me, short, broken, uneasy.

Then I heard it.

Three knocks.

Slow.

Weak.

From underneath.

My whole body turned to anger.

I yanked the rug away. The coffee table scraped the floor. Verónica grabbed my arm.

—Andrés, don’t do something foolish.

I looked at her.

She didn’t say, “There’s nothing there.”

She didn’t say, “You’re imagining things.”

She said, “Don’t do something foolish.”

And in her voice I heard the first confession.

Near the wall, one board didn’t fit like the others. It had a darker cut, a poorly sealed seam. I moved closer and saw something pale tucked between the boards.

A small fingernail.

Camila began to cry without making a sound.

Verónica stepped back.

I grabbed an iron bar that was beside the decorative fireplace. My sister stood in front of me, her face white.

—Please —she murmured.

That word finished breaking me.

I raised the bar.

And when the first blow opened a wound in the new floor, from under my sister’s perfect house came a voice so weak it almost sounded like it was coming from another world: