The Russian detective series "I Know Your Secrets" tells the story of Nina Luchnikova, a professional verifier. She specializes in physiognomy and can instantly detect a liar with just one look. One day, Nina accidentally finds a forgotten passport on a café table. She tries to contact its owner, but instead meets the man's wife. The wife promises to give the passport to her husband, but the verifier realizes she is being deceived. From that day on, someone starts hunting Nina.