Little by little, we discover Armando's fascination with oxidation. It seems to have started by looking at advertising billboards.

Imma tells Maddalena how she thinks things went and Donata opens up. But Imma still has questions about the case.

Alex and Lojacono go to see Biagio's friend and colleague, Renato, and Renato's father, who had been Biagio's professor. Palma talks to his superiors, who want to get involved in the case to speed things along.

Livietta tells Camilla about the scene where Giulio used a word he shouldn't have and was scolded by Renzo. Camilla is still seeing the mouse. The coroner reconstructs the murder for Berardi.

Zia Clo contributes her wisdom about love as this romantic comedy comes to an end.

We get a glimpse of the spaces where a show takes shape, from sewing the costumes, to creating the sets and backdrops. When a model of a set arrives, the job of the team is to translate it into reality, into something big.

Armando tells us how the designs he is fascinated by come to be. It all has to do with billboards, and how they are marked up, torn, and over time, oxidized. The oxidation process is fascinating.

Imma is having a relaxing moment at home, lost in thought, when the doorbell rings, and she gets curious. Valentina is at a cooking demonstration.

Palma and the team have just forty-eight hours to find Varicchio, the father of the two victims. Meanwhile, Palma has to buy furniture, Lojacono meets up with the DA, and Alex comes home late to an angry father.

If you have ever wondered how to make the traditional Easter bread called la Colomba (the dove), in the shape of a dove, the head of a Turin pastry shop invites us into his laboratory-kitchen where Federica gives us detailed instructions as she demonstrates the first phase. Key is il lievito madre (sourdough starter).

Camilla ventures up to Doctor Mattioli's office to see if the nurse is there and to ask him about hallucinations. At the police station, Piccolo is making an effort to make Ferrari like him.

The founder of the Jonian Dolphin Conservation describes one of its projects: Ketos, Euro-Mediterranean center of the sea and cetaceans, based in Taranto.

Journalist Annalena Benini introduces us to different writers from different places in Italy, beginning with Rome, where she interviews Chiara Gamberale, a novelist.

Armando begins describing the structure of his book, and talks about how he envisions a kind of journey, beginning in the far reaches of the universe, down to the tiny details of a flower.

Federica continues working on the dough, adding various ingredients, and making sure that the dough "meshes" without breaking apart. Finally she will shape the dough into the form of a dove.

At police headquarters, Guida is settling in to work on his puzzles, but someone with a familiar face walks in.

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.

Camilla can't rest until she has reported her suspicions to Berardi, and goes down to the police station before school.

The deepest part of the Mediterranean is located between Apulia and Greece. There, conditions are such that there is plenty of food for predators. With the "Researcher for a Day" program, the association gets precious help searching for cetaceans in these waters.

Chiara Gamberale talks about how and where she writes, and how her life has changed now that she has a little girl.

In this segment, describing chapters 3 - 6, we can imagine storms, volcanoes, oceans, and mountains in Armando's photographs.

At the police station the team discusses the case and then they disperse. Lojacono sets up a date with Laura, Palma goes to his new place, Pisanelli goes to spy on his friend the monk, and Ottavia is working late at home.

Imma is troubled, both by seeing Calogiuri again and finding a new dead body. She looks around the apartment and goes to see the seamstress who had found the body.

The detective's mother is not able to provide any useful information to the police. Renzo finds a small object near the front entrance of their apartment building. He also gets a postcard from New York, causing not a little stress to Camilla.