Nostalgia for a time that has already become history. The author describes the atmosphere of the era and the inner state of the characters so realistically that you believe him immediately and unconditionally. Summer of 1970. A komsomol member of one of the workshops, Semyon Valikov, tragically dies at the factory recreation center. Presumably, while drunk, he hit his head on a rock and drowned in the river. The police think it was an accident. However, the victim's friend, Elvira, is sure that Semyon's death was not accidental. She convinces the investigator of the prosecutor's office, Altufiev, not to close the case and involves her friend Zhenya, a law student, in the investigation. Soon, two more young men die in the same area under mysterious circumstances ... the girls manage to find an important piece of evidence that unites all these crimes. They rush to share their find with the investigation, not yet knowing that they will have to pay too high a price for it.…A unique opportunity to return to the recent past for a while and live the most desperate part of their lives together with the characters in a sense of complete reality.