December 16th. A man came to the house today.

The diary continued with smudged ink and increasingly shaky letters.

December 16, 1997. A man came to the house today. Dad told me to lock myself in, but I left the door ajar. He was wearing a gray suit, a gold ring, and a voice that didn’t need to be raised to be frightening. He said Dad had already been paid and now he had to pay up. He also said that in Tampico the sea swallows everything. Mom cried afterward. Dad smashed a glass against the wall.

December 17th. Dad finally told me something. Not everything, because he thinks I’m still a child, but I understood enough. He signed forged papers to approve substandard materials for a port construction project. He says if the pier fails, people could die. They paid him to keep quiet, then he tried to back out, and now they won’t let him. Mom wants us to leave tomorrow. Dad says he needs to make copies of some blueprints and bank statements first. He says if we disappear, the truth has to stay somewhere.

December 18th. I hid this notebook where no one will look for it. If something happens to me and someone finds it: don’t think we left on purpose. They’re hunting us.

Esteban looked up from his newspaper and for the first time in ten years felt that the yard wasn’t his. The wind rustled the branches of the walnut tree with a dry rustle, as if something wanted to climb down. He closed his notebook, went inside, and locked the door. Then he called the police.

What arrived forty minutes later wasn’t a patrol car, but a gray Tsuru without official license plates. A broad-shouldered man got out of the driver’s seat, wearing a light shirt, a wrinkled jacket, and a mustache already faded with gray hair.

“Detective Raúl Contreras,” he said, showing a half-open credential. “You mentioned the Hernández family.”

Esteban let him in. He didn’t offer coffee; his hands were trembling too much for that. He handed him the diary and watched as the detective’s expression changed when he recognized Ramón Vázquez’s name on the following pages.

“I haven’t heard that name in years,” Contreras murmured.

—So you do know him?

Contreras took a while to respond.

—In Tampico, many people know about it. Not everyone survives saying it out loud.

The detective read the last entry. It was from December 20, 1997.

It’s almost eleven. Dad says we’ll leave before dawn for Veracruz. He gave me a key and swore that if we get separated, I should run to Uncle Diego’s house in Ciudad Victoria. He also showed me where he hid the most important copy: “under the house, where no one would dare mess with it.” He didn’t want to tell me more because Mom was listening and she can barely breathe from nerves. There’s a car parked outside that’s been there for two hours. Lights off. I don’t like it. If I don’t write tomorrow, it’s because something happened first.

Contreras gently closed the notebook. Then he asked:

—Is the Hernandez house still empty?

—Since they disappeared. Nobody wanted to buy it.

—Show it to me.

They crossed the yard, opened the rusty side gate, and entered the neighboring house through a forced window. The air inside smelled of dampness, old plaster, and neglect. Esteban suddenly remembered Carmen Hernández bringing him tamales wrapped in embroidered napkins every December, and he felt a pang of shame for not having done more when they disappeared.

Contreras scanned the living room with a flashlight. Nothing. In the kitchen, he found a disassembled cupboard. Nothing there either. In Sofia’s room, among dark stains on the wall, he found a bent nail behind the wardrobe.

“Something used to hang here,” he said.

—A photo?

—Or a plan.

They continued to the washroom and from there to a small tool shed.

The cement floor had a barely visible rectangular line. Contreras tapped it with the butt of his flashlight.

Gap.

He knelt down and found a metal ring hidden underground, stuck in place. He pulled with both hands. The lid gave way with a groan. Beneath it was a narrow cavity, barely a maintenance opening. Inside lay a small, black safe, speckled with rust.

“Good heavens,” Esteban whispered.

—Don’t touch anything.

Contreras photographed the box, then tried the key that had been stuck between the final pages of the diary, wrapped in tape. The lock turned.

Inside there was a sealed envelope, several rolls of photographic film, copies of signed plans, bank receipts, and a microcassette recorder.

Esteban felt fear creeping up his back like ice water.

“Is this enough?” he asked.

—To reopen hell, yes.

They returned to Esteban’s house. Contreras called from the landline, but not the municipal police station. He dialed a number in Ciudad Victoria. He spoke briefly, in a low voice, and repeatedly mentioned “chain of custody” and “without notifying Tampico.” When he hung up, his face was harder.

“I can’t trust the local police,” he said. “In 1997 I was a junior officer. I saw how they buried this case prematurely.”

—By Vázquez?

—For money. For fear. It doesn’t matter which one weighs more.

That night, no one slept. At three in the morning, a vehicle parked in front of the house without turning off its engine. At ten past three, someone knocked on the gate. Not loudly. Three sharp taps.

Contreras pulled out his gun and turned off the light.

The tapping continued.

“Mr. Morales,” a male voice called from outside. “I have a message for you from the detective.”

Contreras didn’t move. Esteban stopped breathing.

“I’m the detective,” Contreras said, approaching the window without revealing his face. “Who sent you?”

Silence.

Then the engine revved up and the vehicle drove away.

It dawned with a sticky, yellow sky. At seven o’clock, two state police trucks arrived. Inside was a thin man with thinning hair and sunken eyes who, upon introducing himself, first looked at the newspaper and then at the abandoned house, as if both made him nauseous.

“Assistant Prosecutor Saldaña,” he said. “We’re going to open this today.”

The first thing to do was to check the microcassette.

Roberto Hernandez’s voice filled Esteban’s small room with an electric crackle.

If anyone hears this, it’s because they wouldn’t let me correct my mistake. My name is Roberto Hernández Salinas, a civil engineer. I certified altered materials in the North Pier project under pressure from businessman Ramón Vázquez. If I turn up dead or disappear with my family, I hold Vázquez and his men responsible. I kept copies of the transfers, the orders, and the plans. I also made a list of those who knew.

The recording ended with a thud, as if a car door had been closed.

Saldaña ran a hand over his mouth.

“With this, we’re not just opening a disappearance case,” he said. “We’re opening cases of homicide, criminal association, corruption, and obstruction of justice.”

“So what now?” Esteban asked.

Contreras looked towards the Hernandez’s backyard.

—Now we’ll find out what Sofia meant by “under the house, where nobody wants to go.”

The experts started with the laundry room.

They lifted tiles, inserted rods, opened cracks. Nothing. Then an agent noticed that the house’s drainage system flowed irregularly into the backyard, right where the ground had been covered with a newer mix at some point in the past.

They dug.

A rotten blanket appeared first, about half a meter away.

At seventy centimeters, a woman’s shoe.

At one meter, bone.

Esteban sat on the bench, his legs numb. He could hear voices, orders, radios, the thumping of boots, but it all seemed to be happening behind a wall of water. He thought of Sofía hiding the diary in her tree one early morning in 1997, perhaps while someone was looking for her. He thought of the girl weighing her last options and tossing the notebook among the branches like someone throwing a bottle into the sea.

At midday, Saldaña emerged with a gray face.

“Three bodies,” he said. “Two adults. A young woman. Buried together.”

Esteban closed his eyes.

Contreras didn’t speak for a long time. Then he asked for a phone. He dialed another number, this time in front of everyone.

“I need to locate Diego Hernández, Roberto’s brother,” he said. “Today.”

Diego arrived at dusk from Ciudad Victoria. He was almost identical to Roberto, only more tired. He didn’t ask if it was true. He looked at the black bags next to the yellow tape and understood everything at once. Then he asked to sit alone with Sofia’s diary.

He spent an hour reading it all. When he came out, his eyes were red but his voice was firm.

“I know who first betrayed my brother,” he said. “An engineer on the project named Mario Sánchez. In December of ’97, he called me drunk and wanted to tell me something. Two days later, he turned up dead in a car crash.”

Contreras and Saldaña exchanged a glance.

“Dead doesn’t mean useless,” the prosecutor said. “If Mario spoke to anyone else, there will be a trace.”

There was one.

The list found in the safe included a bank account in Mario’s wife’s name, along with dates, deposits, and a handwritten note from Roberto: Mario accepted everything. He’s afraid. He says Ramón has already decided to make me disappear if I talk.

That was enough to request an arrest warrant for Ramón Vázquez. But when state agents arrived at his offices, Vázquez was already gone. His house facing the lagoon was empty. His driver didn’t appear either. They only left a message on Esteban’s private answering machine, recorded an hour after the bodies were found.

There are trees that hold secrets, Don Esteban. You should have left everything where it was.

Contreras listened to the audio twice.

“He’s not running away to save himself anymore,” he said. “He’s running away to choose who he takes with him before he falls.”

The hunt lasted three days.

They found him in an old warehouse at the port, the same construction site whose corruption he had tried to conceal.

Surrounded, with no way out, he asked to speak only with a representative from the prosecutor’s office. Saldaña entered wearing a bulletproof vest. Contreras remained at the door.

“All this because of an honorable dead man and a stubborn family,” Vázquez mocked from the shadows.

—Three dead —Saldaña corrected.

—No. Four. He’s forgetting engineer Sánchez.

That sentence was enough to close the last crack in the case. Vázquez smiled, realizing it too late. He confessed enough to explain the ending: Mario had warned that Roberto was planning to report him; the family tried to leave Tampico before dawn; they were intercepted on the old highway; Sofía was followed because she escaped for a few minutes and managed to run back to the neighborhood; Roberto and Carmen died first; the girl was forced to reveal where the copies were; when she was no longer useful to them, they buried her with her parents in the backyard of their own house. The diary, however, never surfaced.

Because Sofia, in her last moments of freedom, had done her duty.

He had thrown it into Esteban’s walnut tree.

Months later, in December 2008, the Hernández house was still empty, but no longer abandoned. The city council had turned it into a small memorial while the corruption case continued to engulf officials, police officers, and businesspeople. In the yard, where the grave had once been, a new rosebush was growing. And in the neighboring yard, the walnut tree still stood tall above the fence, enormous and silent.

Esteban went out one afternoon with a plastic chair and sat down in the shade of the tree. The air from the port carried the scent of salt and damp earth. He closed his eyes and, for the first time in many years, the creaking of the branches didn’t seem threatening.

It seemed to him like a voice that had finally stopped asking for help.