April 1887. Between Rome and Turin. Enrico is in Parliament. Lidia's law reaches the committee. But an explosive case shocks public opinion. Grazia Fontana, Lidia's best friend, is accused of killing her husband. In the Assize Court, prosecuting the case is Fourneau. Before him, Lidia. Is it murder... or self-defense? It's the trial of the century, and Lidia will once again have to choose: protect her heart or rewrite the law?