“What are you doing here, huh?!” This question is on the tip of the tongue of inseparable friends Genka and Dimka, who are staying at an old house. A man is looking for something in a narrow gap in the wall of the building, and when the guys turn to him, he mutters something unintelligible and hurries away. “What is this suspicious stranger up to?” - the boys are perplexed and decide to explore the mysterious hole at their own risk. With a sinking heart, Genka reaches out his hand into the ominous darkness...