After a factory worker is killed, Sergio Bruni is placed on remand for two years before being released for lack of evidence. Shunned by his wife and his colleagues, he must now discover the true culprit.
Bored with her bourgeois life, the young Maria Variani, daughter of a professor, meets Bruno, who is part of an amateur jazz group, and allows herself to be persuaded to join the band that plays during the radio program "The microphone is yours".
Coming of age, a girl is told the truth about her dead father: he is alive, but imprisoned for several crimes he did not commit... With the help of an old noble lady and a young count (who doubles as a daring sea captain), she will fight for the truth, and justice. Her opponent is the State Town's...
