The afternoon sun hung over the town, illuminating the brick walls of the old school, whose tower had been locked for years. Janek had always dreamed of climbing to the top of it, but everyone said it was dangerous and better not to go up there. One day, when he was picking chestnuts in the field with Pola, they saw something unusual. Behind the closed grating, right next to the wall, there was an old, dust-covered key. Next to it was something else - the footprints of shoes that led towards the tower. Pola knelt down to get a better look. - Do you think someone was here? - She asked in a whisper. Janek took the key in his hand. It was heavy and cold. - 'I think it's from that door by the tower. See, nobody's opened them for years. They both looked at each other with a mixture of excitement and uncertainty. Would they dare to enter, even though they knew they shouldn't? They hid the key in their backpacks and decided to come back here after lessons. When they returned, they crept up to the tower, trying not to draw attention to themselves. The door creaked as they inserted the key into the rusty lock, but after a while it opened with a quiet creak. They stepped inside, their footsteps echoing off the stone walls. As they climbed higher and higher up the narrow, winding staircase, they heard a quiet sound, as if someone was... crying? Or perhaps it was the wind wailing through the old planks? Suddenly Pola noticed a small casket on the step. She put her hand on it. - Look! Someone has left something here! At the same moment there was a metallic bang at the top and something rolled across the floor of the tower. Janek and Pola froze in mid-step. Were they alone here? Or was there someone else hiding in the darkness? They stopped, holding their breath....