There were no obvious motives in Nadia's murder, and private detective Tatyana Ivanova worked out different versions. Robbery, revenge, envy - everything fell away. It is only clear that the person whom the girl knew well committed the crime. Under this definition, both the mother of the murdered woman, and the groom, as well as friends and fellow students fell. The door was not broken into, nothing was missing in the apartment, the murder weapon left no trace of the attacker. Mystic! But, even having figured out the criminal, Tanya understands that it is impossible to expose the killer ...