Agent of the Secret Service: Musician Stefan meets a young attractive woman Lidia. Stefan is going on tour to Austria, and Lydia, "accidentally" remembering her Viennese acquaintance, asks to give her a souvenir from Moldova. In Vienna, Stefan is met by people who are well aware of his private life and even familiar with his diary. The musician begins to suspect something is wrong, but when his daughter's well-being is threatened, Stefan becomes truly worried...