Could Sonya Perova, a girl from a good family, have imagined that her modest person would attract the attention of an unknown enemy? And Sonya clearly has such an enemy: first, someone forces a box on her that contains drugs, and then... the girl goes to prison! She is accused of murdering a man unknown to her. The dear, familiar world is collapsing... In addition, Sonya's beloved behaves so strangely that it becomes more and more obvious that he is a participant or even the initiator of these criminal events. A mysterious stranger, who turns out to be a hired killer, intervenes in the case. The more diligently Sonya tries to understand what is happening, the more confused she becomes. Will she never find out who set up all this?..