A funny comedy about a singing detective.

By chance, two middle-aged people met - the telephone operator of the hotel Lina and the chief engineer of the construction department Kirillov, who had arrived on official business from Leningrad in one of the provincial cities of the country. Behind everyone has setbacks in family life. A sincere feeling that brought two lonely people closer together helped to see those around them in a new way. They are already over forty. Both are lonely. Having met by chance and fell in love with each other, they never became happy.

A story about love between famous composer Johann Strauss and Russian beauty Olga.

While investigating a regular traffic accidents detectives find evidence of foreign intelligence involvement.