August twilight shrouded the banks of the rushing river as Karolina jumped off her bike by an old bridge, laced with a web of rusted beams. Just behind her, Artur stopped, still impressed by how much time could be spent on the river, searching for childhood treasures. Lena was already waiting on the bridge, with her camera slung over her shoulder. - You're late! - she called out with a broad smile. - Come on, I have something to show you. They went down under the bridge, where wandering cats usually found shelter and where the walls were covered with forgotten inscriptions. Lena pointed to a crack in the wall, only discovered after the recent downpours. Something glinted in the crack - a rusty medallion, gently pulsating with a pale blue light. Karolina stretched out her hand and carefully reached for the find. At the same moment, the air became heavy, as if the whole world had held its breath. - Can you see it? - whispered Artur, afraid to break the silence. As the medallion touched her skin, Lena felt a slight shudder. The old beams of the bridge trembled, and a shadow emerged from behind the darkness that seemed to have a will of its own. For a moment they thought they heard a whisper - deep, as if coming from beneath the surface of the earth: "Wake me if you are ready to know the truth...". The friends looked at each other, feeling the tension building up. At the same moment, a violent gust of wind broke, and the medallion glowed even brighter. What was hidden on the other side of the light, and should they take the next step? That was yet to be seen...