After his grandmother died, 34-year-old Marek came to her old apartment in Warsaw to help with things. He decided to take away the old sofa, on which he had loved to fall asleep in front of the TV as a child. The sofa was heavy, stained with time, but it had enormous emotional value for him.

While moving the sofa, he heard a creaking sound, as if something had shifted inside. When he got home, when he tried to disassemble the structure to clean it, he found a neatly sewn section of the upholstery. The threads were old, yellowed, but still holding. He carefully tore open the fabric and found an envelope wrapped in cellophane inside.

His heart beat faster when he saw the signature: “Marek. From Grandma. Open only when I’m gone.” His hands trembled as he opened the yellowed sheet of paper. In the note, Grandma wrote about a terrible secret that she could never tell during her lifetime.

It turned out that in her youth she worked as a nurse in a secret clinic where dubious experiments were conducted. One of them involved a woman in her eighth month of pregnancy who died after a strange injection. The child was saved. The grandmother could not forget the child’s eyes. She learned that the baby had been transferred to a state shelter under a false name. Years later, she realized that it was… her own son. But it was too late – he grew up in someone else’s family, never knowing the truth. And he was Marek’s father. So, Marek himself is the result of a terrible experiment that no one suspected. The note also said that a metal box was hidden in the sofa. There were newspaper clippings about that clinic, photos of people in white coats, and another letter. In the second letter, the grandmother asked him not to search for the truth any further. But Marek could not stop. He began an investigation. A few weeks later, he disappeared from contact. The police found his apartment completely overturned, but with no signs of struggle. On the wall was a sign: “Some secrets should stay on sofas.” Neighbors recalled that strangers in black came to visit him. Marek’s mother, having learned about the disappearance, lay down with a stroke. After that, other former employees of that clinic began to disappear. The case was closed due to “lack of evidence.” But the grandmother’s neighbor claimed that she had always been afraid of mirrors. She said that someone was watching them. One of the photos in the box was signed “Object No. 9.” It was Marek at the age of 6. After his disappearance, all the documents about the shelter where his father supposedly grew up also disappeared. This sofa was not just old furniture – it was a portal to the forbidden past. When Marek’s sister came to the apartment to pick up things, someone had already taken the sofa. Without a trace. In its place was an envelope: “Don’t look for me. Marek.”