Moscow is left stunned by a series of murders with the same MO: the victims were all shot in the back of the head while kneeling. The case draws the attention of investigator Yekaterina Pavlenkova. Her cold, calculating mind and professional logic help her discover subtle links between the murders of seemingly unconnected people. Pavlenkova realises that she's dealing with a serial killer. Her goal is to stay one step ahead of the murderer. As the number of victims grows, the life of her boss General Bocharnikov is put at risk. As she unravels the murderer's latest ploy, she finds herself in danger of becoming the next victim.