Igor Gladyshev, a private detective, gets into a bad story. Investigating the case of the theft of money from businessman Sheremetyev, he is going to interrogate his son’s fiancée Tatyana, goes to her home, but there he finds the girl murdered. Before Gladyshev could blink an eye, he was arrested on suspicion of murder. It’s hard to say how a private detective would look for a criminal while in a pre-trial detention center, but fortunately... a misfortune happened. The police soon discovered a girl named Alina, who had worked as a model for Sheremetyev’s son, wounded with a knife. Gladyshev knew this girl well, and as soon as he was released on his own recognizance, he immediately went to where the chances of exposing the killer were greater than anywhere else...