North-West of Moscow. Cut off from the rest of the Metro a piece of the Gray line between Petrovsko-Razumovskaya and Altufiev. Almost twenty years have passed since the day hordes of rats destroyed Timiryazevskaya and Dmitrovskaya, but people still avoid these notorious places. Even the most brave stalkers, even the most desperate looters, try not to come here. These places are deserted. But... they are by no means lifeless! They are a territory of warlike, not afraid of radiation mutant ratmans, zealously protecting their part of the Metro from people. And woe to that person who will be in their possession and fall into their clutches! And now the stalker Vostok is sent to these dangerous and forbidden lands for people with a task from the scientists of Polis to get and deliver them a living ratman.