A billionaire oligarch, Pasha Ivanov, is found dead outside his high-rise Moscow flat. All evidence leads to the conclusion that Ivanov has taken his own life by jumping from his penthouse apartment. Renko is not so sure and decides to conduct his investigation despite the clear displeasure this evinces up and down the police ladder and amongst the surviving owners of Ivanov's company. In this, Renko's stubborn, principled independence has not changed at all since he first came to view in Gorky Park. When a second related death occurs in the 30-kilometer exclusion zone surrounding Chernobyl, Renko's superiors are pleased to pack him off to investigate the death in the Ukraine. The majority of the action takes place in the exclusion zone. Renko plods on despite himself and despite attempts by virtually everyone to leave things alone. This is the 5th Renko-novel.