Private detective Tatyana Ivanova is hired by Dmitry Somov: his daughter Olesya, recently found after many years of separation, was found dead in a local museum. Watchman Voronkov, who was found intoxicated near the girl’s body, was arrested on suspicion of murder. According to him, he had never even seen Olesya even once in his life - neither before nor after death... Rumor has it that recently the girl had a virtual admirer, whose existence was known to her relatives and friends, but no one saw him. The father of the deceased urgently asks Tatyana to find the real killer, and always before the police do it...