Lidia is determined to keep fighting for equality. When a friend is murdered and found with two cryptic notes in his pocket, she teams up with Jacopo.

As Lidia investigates a mysterious poisoning at a prestigious boarding school, Jacopo digs deeper into their friend's death and Marianna uncovers a lie.

Enrico remains doubtful about running for Parliament while Prosecutor Fourneau and Lidia struggle to connect the victims of a series of brutal murders.

An unexpected wedding is disrupted by an unexpected death. As Lidia looks to get to the bottom of it, Enrico prepares a very important speech.

Despite Lidia's conflicted feelings for Fourneau, the murder of a prison guard forces them to collaborate again, as Jacopo edges closer to finding Nitti.

In the wake of a shooting, Fourneau takes over the Nitti investigation. Enrico receives an eminent guest, while Lidia and Jacopo race against the clock.