Truffle hunting is a peculiar activity, one that requires the collaboration of a dog. And you never want to let on how many truffles you find, even if you are friends with other truffle hunters.

The mouse is still an issue at Camilla's house. At police headquarters, Berardi has his hands full with the mother of the murdered detective and Mattioli's wife.

Melania talks about her relationship with her father when he was still alive. He didn't say much, but unbeknownst to her, tried to get a story of hers published. She talks about one her favorite parts of Rome: Isola Tiberina (Tiber Island), the only river island in the part of the Tiber that runs through Rome.

Ottavia and Palma talk about his new apartment and the fact that it is still empty. Lojacono gets some good news from his friend Paolo and shares it with Marinella. He goes to the train station to wait for Laura and gets an idea about the case.

This episode is about a specialty from Colonnata, a little village above Carrara, where marble is quarried. It's pork lard, which may not sound very appetizing but is beloved by Italians all over the peninsula. A little goes a long way, but savored with typical unsalted Tuscan bread, it is pretty special. And marble plays an important part.

Camilla, in conversation with her mother, hopes that the postcard from New York is just a misunderstanding. Renzo has a moment of truth by a dumpster. Later, he says something about Dr. Mattioli that gives Camilla an idea about her "hallucinations."

Melania Gaia Mazzucco talks about one of her novels set in seventeenth-century Trastevere, quite a different place than what we see today. Although she has traveled the world, Mazzucco comes from generations of romani di Roma (Romans from Rome).

Lojacono is not at all convinced that Varricchio killed his own children, especially after talking to him. Pisanelli got some bad news about another retiree having taken his own life. Pisanelli had been watching over the wrong home.

Armando talks about how the works of Duchamp influenced his work and that of so many contemporary artists. The choice of a unique exhibition hall played a part, as well.

This is the story of an Italian, who haveing been brought up on a dairy farm, travels the world, ending up in Australia, only to return to Italy with some new ideas about the cheese he wants to create.

Camilla can't help herself and goes to the home of Mattioli's former nurse. Gaetano leaves Camilla a text message. Note that in Italy, texting while driving is now prohibited.

Annalena continues talking with Paolo Giordano, who talks about how places such as Afghanistan and Apulia have influenced his writing.

Lojacono follows Varricchio to his hotel to ask a few more questions, in private.

Not only are Armando's photographs reminiscent of the universe and nature — they also recall other works of art from history.

The bread from Altamura (in Apulia) is very famous among Italian bread connoisseurs. Beppe di Gesù, our host in this segment, comes from a long line of bakers. Breadmaking is so special that it's called l'arte bianca (the white art), because of the color of the flour.