About the book: year / Private "Weekend hike" for tourists - the most ordinary people - and their instructor Denis becomes extreme and life-threatening . Not by chance and not by coincidence. It is clear that one of the group members is playing the deadly game. Who is he and what is his goal? Evgenia asks her “ex,” policeman Ivolgin, to find her missing current husband, a scientist involved in mysterious experiments. An official police investigation is also underway, and two versions of the incident are emerging. But a third one is also possible...