Anna Vlasova, the daughter of a famous businessman, fell from the roof of the shopping center. Investigator Borisov finds no motive for the murder, especially since drugs were found in the girl's blood. But the sister of the deceased Kira does not believe that Anna herself decided to settle accounts with life. She decides to investigate her sister's strange death and convinces Borisov not to close the case. He continues to look for evidence, and meanwhile Kira herself is looking for the smallest thread to unravel the tangle. And events begin to unfold at an alarming rate: all Ani's acquaintances, whose testimonies were important to the investigation, perish. Kira has no idea that the truth she is looking for can be deadly for herself.