A boy asks forensic medicine for information on the cause of death of a friend and a few days later he too is found dead. In the hideout they thought was Imardi's, our men found his body: someone had walled him up alive. Carlo and his family restart the investigation and arrive at Leonardo Sfera, whom Marta, Muzo and Nusco arrested many years earlier for the murder of his girlfriend, Xenia, one of the girls who prostituted herself for Imardi.

Carlo understands from various factors that it was Nusco who killed Xenia years earlier and that is why Sfera wants him dead: he paid for a crime he did not commit. And Muzo and Marta were punished by depriving them of their dearest affections for not believing him.

Clara, Carlo's first wife, disappears the day he leaves prison to go under house arrest at her daughter Alba's house. It is soon discovered that she has left in a car. Alba thinks it was a kidnapping, while Carlo is convinced that she has fled voluntarily. In the meantime, Bruno and Alice, Clara's second family, arrive in Rome from Geneva and Alice recognizes the man who took Clara away: she saw him talking to her mother two years earlier.