It all started one Friday afternoon, when Kacper, the self-proclaimed master of the cutting retort, challenged the Sunday Explorers club to a memorable end... someone who couldn't handle the nerve-wracking atmosphere of a night at the old abandoned school in Berry Street. The club was quite unique. Apart from Kacper, it included: Nina, whose jokes were sharper than a laser beam; Igor, a horror aficionado, walking encyclopaedia of conspiracy theories and an amateur of onion crisps; and Magda, a meme specialist and a master at planting fake spiders. - Bet on who runs out screaming first! - announced Kacper, raising the spirits of Igor's chip team and demonstratively aiming a laser at the school corridor noticeboard. - Whoever loses bets on an extra hour of maths next week with Mrs Jolka. The premise sounded simple - spend the night in the biology room, known for its walls tightly covered with cut-outs from a decade ago and a dried-up crab still living in the cupboard, to which Igor regularly lays his sunglasses. In the evening, armed with torches, laughter and packets of crunchy snacks, they turned up at the school door. For a while, they tried to open it with a nail file (Magda was sure that any padlock could be opened with it), until it turned out that the door was simply open. Inside, the corridors seemed longer than usual to them, and echoed off the walls like an old computer game. In the biology room, besides the usual menagerie of dried-up monsters, awaited them... freshly brewed tea in four cups and a short note: "Have a good night, Sunday Explorers! - Management." Before they had time to cool down from their laughter (and their suspicions that the headmistress was stalking them on TikTok), a quiet, rhythmic tapping sounded from the corridor. Then another... And when Igor poked his head out of the door, he saw a shadow under the notice board and... a red light that pulsed to the beat of the tapping. At that moment, everyone held their breath, and Nina swallowed a joke before it could leave her mouth. What or who was waiting for them in the school corridors that night and was, surely, Kacper the only master of the cutting retort in the area?