Several fatal accidents occur at once at the reinforced concrete products factory in the city of N. An investigator from the regional center comes to investigate the mysterious series of deaths, who understands that it is not technology that is to blame, but psychology. A number of people involved in a vicious suicidal circle are ready to take a step into the abyss. Everyone has their own reasons and motives. The investigator, when confronted with these stories, recalls his own personal tragedy.

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