If someone were to ask Igor what his greatest talent is, he would answer without hesitation: "Getting into trouble that nobody predicted". If someone had asked his mum, she would probably have answered exactly the same, only with the addition of a heavy sigh and a gaze meaningfully directed towards the ceiling. But on that June Saturday, when the sun was gliding across the sky like mad and the town of Toporniki seemed sleepy and stretched out like a cat on a windowsill, Igor was just looking for inspiration for his next action. His pack - the Trouble Experts Club - was ready for anything, as long as it kept them from getting into a state where they were in danger of getting bored. The club consisted of four people: Igor (president and unofficial provocateur of all actions), Lena (known as Silent Storm - a taciturn genius of strategy), Filip (official recorder of antics, master of small technological scams) and Hanka (a budding poet, but an expert at coming up with the best excuses). They met traditionally under the old lime tree in the square, a few minutes after 8pm, armed with bottles of coke, crisps and a notebook in which a blank plan for the next mission was already waiting. Conversations wandered from school topics, to the typical "what if...", to a topic that suddenly appeared and lit up everyone's eyes: - Hey, did you know that the old school in Shadow Street is still standing empty? - chuckled Filip, and Igor immediately felt a familiar tingling in his fingers. It turned out that last night the security guards had noticed strange lights on the first floor, and the local neighbours had heard what seemed like the sounds of footsteps and laughter, even though the building was supposed to have been locked up for a year. These rumours only heightened the atmosphere. - Why don't we have a movie night there? - suggested Hanka, glancing at the others with a conspiratorial smile. - Or a journalistic interview! - added Lena, pulling out her smartphone with her notes. After a short deliberation, the plan was ready: that night they would enter the old school, record what they could, and find out who or what had been playing there recently. Everyone was excited - even Philip, who was usually sceptical, was loading the drone with enthusiasm this time. At around 2am, armed with torches, powerbanks, sandwiches and a spare roll of duct tape (don't ask why - the Trouble Experts Club should always be ready for anything), they sneaked through the bushes around the school fence. Through the tilted window of the biology room they went inside, trying not to make any noise. The building breathed darkness and smelled of dust, and their footsteps echoed off the walls. After a few minutes of wandering, Lena stopped everyone with a movement of her hand. The light of a torch flashed at the end of the corridor and a quiet, disturbing giggle reached their ears. Igor felt shivers run down his spine. - 'Either someone warned us, or...' - whispered Hanka. Just at that moment, something clattered quietly just behind their backs, and the door to the room next door swung open with a distinctive creak. The Trouble Experts Club looked at each other simultaneously, with their eyes wide open. There was a thrill of anxiety and excitement in the air, and the next move seemed to matter more than they might have thought....