Distance is not always measured in kilometers. Sometimes these are horizons - three hundred and fifty, no more, no less. Sometimes - days and weeks. Sometimes - an endless string of tubing rings. And sometimes - the lives of your comrades. Brothers. But the one who walks will master the road. The thirty-first clip begins its journey. What will they encounter? What difficulties will you have to overcome? And will everyone be able to survive when they meet them? What mysteries will they reveal? Will it be possible to answer the most important questions that have been tormenting the people of the House for a generation now? About the Pied Piper of Hamelin and the Constructor, about morphs and the Programmer, about Secret Paths and vile creatures of Stok... And the most important question is how people ended up here, in these gloomy concrete jungle? Is it possible to get out of here? What is there on the zero horizon? Will there be an answer at the end of the tunnel? Answers to questions will be received by the one who can snatch them from the tenacious clutches of the Underworld. The one who walks will master the road. But will he master it?