Stretching just below the forest, the old sanatorium had stood abandoned for decades. Rumour had it that Europe's richest visitors used to come here, but it all came to an abrupt end in the 1980s. Since then, the place has become overgrown with moss, the walls covered with graffiti, and there is a dense silence all around, broken only by the cawing of crows. A group of friends - Lena, Igor, Victor and Sara - decided to spend a night at the sanatorium to prove to each other that no legend would scare them. They were seventeen years old, they were rambunctious high school students and none of them believed in ghosts. Lena, the most assertive of the pack, forced her way in through a side hinged door that groaned ominously in the darkness. Sara squeezed Viktor's shoulder, trying not to show that her hands were trembling. The sanatorium had three floors and two sweeping staircases. The whole was topped by a tower - their goal for the night. Lost in the trees, it was rumoured to have once been a vantage point, but today no one looked up there anymore. The guys made a bet on who would find the entrance to the top first. Lena laughed at their rivalry, and Sara reluctantly decided to join in, although out of the corner of her eye she checked that no one was watching her through the broken windows. The first floor greeted them with a chill and the smell of damp. Victor illuminated the way with a torch whose light reflected off the floor, time and again showing abandoned beds and shabby display cabinets with scattered cards. They passed through several rooms, whisperingly discussing all the traces of former times they encountered, until they came to a large hall. The remains of a chandelier dangled from the ceiling and glass crunched underfoot. "Do you know that someone stayed here last night?" - chuckled Igor, pointing to a bottle of wine and fresh shoe marks in the dust. No one acknowledged the joke, and the atmosphere suddenly thickened. They reached the stairs leading to the second floor. Here the air seemed heavier and each step echoed back from the dark corridors. Lena, leading the procession, noticed that the door to the doctor's office was ajar. She peeked through the crack and froze. On the desk, among the disarrayed binders and yellowed papers, lay a fresh sheet of paper with the words: "Don't climb the tower, if your life is good to you". "Is this some kind of joke?" - Victor asked, but his voice trembled. Igor looked at Sara, who took a step back. Lena smiled wryly and put the note in her pocket. Passing the deserted halls, they finally found the flap to the attic. It was locked with an old, rusty lock, which Igor easily opened with a penknife. A creaking ladder led upstairs, straight under the Copper Tower. But before Lena could get in first, they heard the sound of feet in the corridor below them - someone or something was slowly approaching towards them. A faint shadow appeared at the end of the corridor. They froze. Was it just the wind, or had someone else woken up that night in the old sanatorium?