"Svoi-Chuzhoi" is a Russian crime drama series about an adopted son of a notorious mafia boss. The former "godfather" of a criminal group leaves his illegal business behind and becomes a banker. However, he doesn't stray from his old methods and principles in his new venture, so he needs someone on his side in the prosecutor's office. He has the perfect candidate - an orphan boy raised in his family. The young man is unknown to the police, and he is fiercely loyal to his "father," which is why he is chosen to work in the prosecutor's office.