Antek had always found their tenement on Jasna Street as boring as Monday maths lessons. Maybe that was why he used to sneak out to the staircase every evening to extinguish his thoughts in the twilight, listening to the quiet hum of the city. One evening, as the sun was already melting among the red of the rooftops, he heard quiet footsteps. It was Lena, the new neighbour from the third floor. She had a storm of red hair and the unsettling gaze of someone who knows secrets undreamed of by adults. They didn't speak to each other at first, but after a few minutes of silent presence, Lena pointed her finger at the wall opposite the lift. "Look!" - she whispered. Antek squinted his eyes. There was a golden glow on the old plaster, as if someone had lit a lamp, although the bulb had not worked for weeks. The light moved up the stairs, pulsed with the rhythm of someone's invisible breath. "I think it's a reflection from the street...?" - Antek tried to explain, but Lena shook her head. She pulled him by the sleeve, they hid behind a pillar and watched. The light began to form shapes, as if luminous letters or symbols they didn't know were dancing on the wall. They were surprised to see that the glow was slowly moving towards an abandoned cellar where no one had gone down for years. Lena looked at Antek. "Shall we go?" - she asked quietly, her voice trembling but her eyes shining with excitement. For a moment, everything went quiet: the city, the breathing, their fear. A faint light could be seen behind the cellar door, completely incongruous for this place. They crossed the threshold in silence. The door slammed silently behind them, and in the darkness through the golden light the outlines of something completely unknown began to emerge....