It would not have been fortunate, but misfortune would have helped: Dimina and Leshka’s dad’s car would not have broken down on the way, the whole family would not have had to linger near the ancient monastery - the children would not have had the opportunity to experience an exciting adventure once again. And that is to say, can you sit still when a strange hum is heard next to the ancient walls, and then a blinding light suddenly flashes? And in the village nearby, strange things are happening: you eat an apple and you fall asleep like the dead. “No, we will never leave here without unraveling all these secrets!” the brothers say to themselves and decide to immediately go to the monastery. And here, behind the heavy oak door...