Based on the novel of the same name by Anna and Sergey Litvinov. A well-known private investigator was approached by a man with a request to find his missing mistress Alyona and immediately issued an extremely generous advance. At first glance, the detective, Alyona's life was unremarkable - there seemed to be nothing to cling to. But in the course of the investigation, new victims began to appear and now this case has taken a completely different turn. What was the modest Alyona hiding if her disappearance entailed such strange and terrible events?