Thou Shalt Not Kill

Just when peace seems to have been restored to the Ferro family, Lucia's former cellmate Monica pays a visit to their house and upsets the harmony that mother and daughter were trying to re-establish.

Gloria Severini's body is found on her living-room floor by the cleaning lady; when Valeria arrives at the crime scene, the victim's 20-year-old son is nowhere to be found.

Valeria asks Lucia for the truth about why she killed her father; Lucia reveals her husband wanted to leave her, but tells Giulio that she lied to her daughter to protect her.

When a man is run over on the highway by a hit-and-run driver, Valeria quickly grasps that aspects of the case aren't as simple as they seem.

When an openly gay nightclub owner is found dead, Inspector Ferro questions his circle of friends and acquaintances.

Valeria works toward solving the Petrone case and submits a transfer request; Giulio confides in Lucia that he is shaken by Valeria's decision to transfer.