Lojacono and Di Nardo go to see Biagio's ex-girlfriend to ask her one more question. She happens to remember something that gives them a new lead. They then go and talk to Renato, Biagio's friend and colleague.

Donato Brenca has been making cheese for about 20 years, and although he strives to make better and better cheese, he sticks to the same method he has always employed.

Having read about Mattioli's death, Camilla rushes to Berardi's office, where he is checking some documents with Torre. She participates and comes across an interesting piece of information.

Annalena continues her conversation with Piperno in his favorite restaurant. They look at some photos from his past while they wait for their meal to be served.

Laura and Lojacono go to Laura's house and she begins cooking dinner. At his hotel, Aragona has a chance to see Irene, the new housemaid, in the dining room and can't take his eyes off her. Francesco brings Giorgia breakfast in bed. It's una graffa (a kind of doughnut).

To make pasta, only 2 ingredients are strictly necessary: semola (durum wheat flour) and water. But atmospheric conditions make all the difference.

Renzo comes home late after a meeting and finds Camilla on the couch deep in thought. She lets him know she has been connecting the dots between the postcard and the merengue instructor. She goes off to bed but finds a surprise on the way.

Alessandro explains some things about the characters in his books and tells a story about when he won the Strega award. The Strega Award is the most important Italian literary award. It gets its name from one of its creators, the owner of the company producing Strega, a brand of an amaro (after-dinner, digestive bitters).

At the hotel where Aragona stays, he tries to find out who the new housekeeping person is. Down at the police station, there is news concerning the prostitute Varricchio says he spent time with the night of the murder.

Italy is known for its pasta. The Zampino family was able to give new life to an old flour mill from the sixteen hundreds and turn it into a productive plant where they produce pasta keeping to traditional methods.

Leaving the outskirts of Rome, Annalena goes to a middle-class neighborhood where she meets professor and writer, Alessandro Piperno. He talks about what it was like growing up there and about his identity as a writer.

Lojacono goes to Letizia's trattoria and tells her about the bad news about the witness. She tries to reassure him but also has a new customer to attend to. Francesco can't let Giorgia go and sleeps in the car in front of her house.

How are the harvested truffles divided up? And besides being sold whole, how are they further processed? Paolo and Stefania tell us the story.

After her trip to the Tiber River, Camilla goes to pick up Livietta at Giulio's house, where the two kids are dancing to Merengue. Camilla has some questions about that. Meanwhile, Berardi and Torre are busy with the coroner, identifying a corpse.

Melania Mazzucco grew up in a part of Rome on the outskirts, not the part people usually associate with the beautiful city. The white Fiat 500 her father bought for the family became an important part of her life.