Every school has its secrets, but no one expected that something unusual would happen in ours - an old school surrounded by centuries-old lime trees. When Klaudia, Michał and Basia arranged to meet after school, they thought their greatest adventure would be sneaking through the corridors to avoid bumping into the caretaker. However, when the rain came down on Friday afternoon and the school corridor was deserted, Klaudia suggested a trip to the attic of the building. It was said that no one had been up there for years, and the stairs creaked so creepily that the sound alone could give you the creeps. Basia agreed, albeit reluctantly, and Michal had long dreamt of seeing what lay behind the closed doors. Full of excitement, armed with torches from their phones and a chocolate bar just in case, they set off upstairs. In the attic, semi-darkness mingled with the smell of old wood and dust. Piles of cobweb-covered furniture, boxes full of yellowed notebooks and a large portrait of the headmaster from the 1980s looked at them intently. Suddenly Klaudia noticed a small box squeezed between the suitcases. Inside lay an old pocket watch - faded but with a delicate engraving on the top. When Michal took it in his hand, the hands began to move, although the watch had no battery or winding. Basia felt a shudder. - 'It probably works on a magnet,' she tried to joke, but no one laughed. Klaudia touched the dial and at the same moment the watch made a strange sound - as if there was a quiet ticking coming from inside, inaudible to anyone but them. Suddenly there was a deafening clatter throughout the room. There was a rustling sound coming from behind one of the tall cupboards, as if someone or something was moving very carefully there. The friends looked at each other, their hearts starting to beat faster. Michael squeezed his watch tighter and then the hands suddenly stopped at an hour they all knew, but could not remember why it was so important.... Basia raised the torch and pointed the light towards the wardrobe. A silhouette slowly emerged from the shadows....