Penelope gets some news she shares with Valentina. Imma is upset about Calogiuri's leaving, but throws herself into her work, confronting Bruno's son about his project in Vallone della Femmina.

Imma interviews Giulio Bruno, the son of the murdered architect, Domenico. Giulio seems forthcoming about what happened with his uncle in Argentina.

Valentina goes to see her grandmother, who may have dementia but can still offer good advice. Imma discovers that her husband plays soccer with the prefect, Moliterni's husband.

Diana has some information for Imma, some of it urgent. Imma calls on Calogiuri even though he is about to take his exam.

Imma and Pietro go to dinner at the prefect's and play with some Latin proverbs. One of these gives Imma an idea about the case.

Pietro seems to have a great time at the dinner party, while Imma is focused on work and on finding the right moment to talk to her hostess.

Imma's excellent memory helps her figure out some details of the murder, as she talks to the brother from Argentina.

Domenico Bruno tells Imma the whole story of how his brother died.

Imma goes home after a long day to find Pietro and Valentina in the kitchen. She relaxes on the sofa only to catch sight of a picture of her as a girl...

Calogiuri has become a marshal. At Imma's house, the morning is going fairly normally, when a phone call from Diana comes. It can't be good.

Valentina has begun studying again, and talks to Bea after class. There is a cloud over Imma's office, as she and Calogiuri talk about the case.

Imma goes to join Calogiuri in the area of Matera where homes and churches were built into the rock. There are i sassi (cave houses carved out of the rocks) and the lamioni, barrel-vaulted rooms leading to the cave houses. She is guided by Eustacchio, a kid she thinks should be in school. But he knows quite a bit about the history of the place.

For once, Valentina comes home in a good mood. Imma tells Pietro about her ex-classmate's murder. Don Mariano has a conversation with Samuele, a kid who seems to be in contact with Valentina, but who evidently has had some problems with the law.

Lombardi shows up for an informal meeting to talk about a building project. Meanwhile, Imma is driven to Grottole by Matarazzo who is going a bit too fast.

Imma and Matarazzo go to the butcher shop in Grottole and find out some information from both the butcher and a woman seated there. Calogiuri has a little information from the coroner for Imma.