Moscow, 1957, World Festival of Youth and Students. "Universal Friendship" is carried out under the watchful supervision of the all-powerful KGB. Igor Sinitsky, a student at Moscow State University and a talented jazz musician, lives with his uncle, Academician Lerner, in a "secure" house. Foreign intelligence is very interested in the academician's work. The charming Frenchwoman Michelle is entrusted with stealing Lerner's secret documents on the development of chemical weapons. In turn, the omnipresent KGB recruits Igor, using very dirty methods. The intelligence services of the two countries took into account everything except one thing - the possibility of the emergence of a real feeling between young people. But this happens, and events escape from the control of the intelligence officers, developing according to a new scenario written by love and the stars.