The protagonist of the series "The Traitor" is a regular police officer named Igor Rebrov, whose career aspirations are shattered by the injustice of the system. He joins the force with a sincere belief in justice and a fair trial, but gradually succumbs to the influence of his senior colleagues and starts accepting bribes, just like them. One day, he is asked to help free a criminal authority from prison. However, the investigator on this case turns out to be a strict and principled lady who cannot be bribed or intimidated - the young beauty Olga Barentseva.