Black shower catchers. The case of the eye socket

The provincial city of Ensk is shaking a series of murders, frightening with its cruelty. It was established that the killer is a loner, obviously a maniac, characterized by sophisticated sadism. His murders turn into a terrible ritual, and it is not known how many more people he should destroy to quench the thirst for blood.
The local police lost their feet in search of a criminal, because he is a cunning and elusive, and his actions are unpredictable and devoid of visible logic. But you can’t hesitate.
To help in an investigation from St. Petersburg, a senior agent of the detective police Roman Muromtsev arrives, having experience in the investigation of serial murders.
A tough game begins between the detective and the criminal, the winner in which is unknown to the end