When Arkady Renko is charged with investigating the murder of Alexei Kazasky, the Deputy Minister of Defence, he knows he has to tread carefully. Alexei Kazasky is a high-profile politician and has a complicated relationship with Putin. This investigation clearly has Kremlin approval, but, as with everything in Russia, things are not always what they seem.

Already preoccupied with his developing Parkinson’s, Arkady finds he has more to worry about. The war in Ukraine is gaining momentum, and his adopted son Zhenya has become involved with the Black Army, a Russo-Ukrainian group of hacktivists. Moreover, as Arkady digs deeper into Kazasky’s murder, he realizes that the man’s death may have been more politically motivated than he first assumed.