About the book: 2020 / This should be the last for Roman Nesterov and the stalkers of Cartesian Coordinates. Consumed by a sense of guilt, burdened with unanswered questions, he goes to where it all once began for him. To the Moscow Zone, which took his brother away and destroyed his life. Meanwhile, among the rotten swamps and damp copses of the Old Zone, the military stalker Shakespeare is on the trail of a conspiracy connecting the Obelisk group - candy wrappers living in an abandoned nuclear power plant - and adherents of the Obsidian organization. The coordinated attack of "Obsidian" in most of the world's Zones leaves TsAI beheaded and unable to withstand the impending threat. The enemies are one step away from carrying out their plan - the creation of a planetary-scale Zone, and on their way they only have a desperate stalker, tormented by the ghosts of the past, and a mercenary, turned by TsAI scientists into something that can hardly be called human.