During the Cold War, a local Polish officer and a young Soviet woman wedded to a Soviet officer are drawn together by music.

A strange combination of circumstances leads the forty-year-old engineer Igor into the hall of the old cinema, where the film session has already begun. The main character of the picture is the poet Belov, the same romantic loser, disappointed in himself and in everything - surprisingly similar to him. Moreover, Igor soon realizes that he is looking from the side at his own life. What is happening on the screen becomes a shock and revelation for him. In the dark hall of the mysterious cinema, fate gives Igor the only chance to start all over again.