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.

Imma and Calogiuri manage to interview Bizzari who admits a few things about Stella. Diana confesses that even though her husband has come home, it's not any better than before, when he was gone.

Imma stops by to see her mother, who has been opening all the drawers, creating more work for Nikolaus, her caregiver. Imma and Matarazzo make the trip, on narrow mountain roads, to Ginosa, where De Nardis lives. He invites them in.

Imma interviews De Nardis who tells a good story, not that Matarazzo and Imma are totally convinced, however. And then they go to the bar and find out a bit more about their suspect.

Imma goes to the land registry office in Ginosa to find out more about Palazzo De Nardis. She manages to obtain some information from the person in charge and goes to see Signora D'Avena.

Imma talks to Stacchio again and finds a few more pieces to the puzzle. She also talks to the coroner to learn some details about Stella's death. She also has new information about a certain phone call.

Imma attends Stella's burial at the cemetery and is struck by the writing on a wreath. She introduces herself to the woman who placed it on the gravesite and tries to find out a little more about Stella's life. She is also drawn to the ossuary or wall burial site bearing the name, Centino Latronico. We recall him as the man Imma suspects might have been her real father.

Calogiuri shows up at Imma's office with a possible piece of evidence, meriting a trip to see Stacchio again. They head out together but there is some troubling news awaiting them there.

Imma gets some information from her "helpful" colleague and goes to Eustacchio's school to find out more. Viewers might recognize his teacher.

Leaving school, Valentina and her friend meet up with a certain Samuel who has a little present for Valentina. Imma and Calogiuri see Stacchio's friends and ask them some questions, with the pretext that Calogiuri had lost his dog.

Imma manages to interview Stacchio's father, who is not exactly forthcoming. Back home, Imma gets complaints about her cooking and they listen to the news report about the missing boy.

As sometimes happens, something Pietro says, even in an intimate moment, reminds Imma of some detail in the case. Off she goes with Calogiuri to try for some new leads.