The new owners of a farm, lost among the Belarusian swamps, are faced with a monstrous discovery: fragments of bodies hidden in an abandoned barn. Patients of a psychiatric hospital located nearby are suspected. It cannot be otherwise, because people who have already committed cruel crimes are kept behind barbed wire. The head doctor of the hospital is in no hurry to protect his patients, he wants to know the truth. He personally asks Alexei Tronov for help, hoping that his project will not be as biased towards the clinic as the police. Tronov, intrigued by the unusual case, agrees to help. He doesn’t even realize that this time the participants in his project were selected by a serial killer who remained elusive for many years.