Di Nardo and Romano go to see Nunzia's mother. She and her two sons are surprised by the visit and are on the defensive but one name keeps coming up as the policemen question them. At headquarters, Pisanello is studying a series of alleged suicides he is suspicious about.

Fulvio shows tells us the story of a door, a very famous door, called the Alchemist's Door, also called the Magic Door, or the Door to Heaven, a monument built by Massimiliano Savelli Palombara, Marquis of Pietraforte on the grounds of his villa in Rome.

Giuseppe's passion for his work puts his patients' well-being ahead of following the rules and getting chastised by his superiors. Giorgio is much more easygoing and as soon as the shift is over, is ready to have fun.

Aragona meets up with Marina outside of the workplace and she feels freer to give up some information. Then Lojacono and Aragona go to see the notary again. He is not alone.

Giuseppe walks through the market and witnesses a scene whereby a carabiniere policeman chases down a kid who was trying to steal some food. The kid is one Giuseppe has seen before.

The architect is not happy about his visitors from the police and is on the defensive about Nunzia, the girl. As he is having dinner at his usual spot, Lojacono gets a phone call from the PM.

The evening Giorgio planned to spend with Cloe doesn't turn out as he had hoped. The next day at the hospital, on their first day of work, Giorgio and Giuseppe get to know Sister Helga who rules with an iron fist.

Lojacono and Aragona interview 2 of the notary's employees, while Romano and Di Nardo go back to the mysterious girl's apartment, this time with a warrant.

Giuseppe and Giorgio are dressed to go out on the town. They get temporarily sidelined by a kid trying to break into a house, who then falls. They go to a nightspot where there is a performer Giorgio has his eye on.

Giuliano tells about meeting Vera for the first time, and then he and Vera take turns telling about how their relationship developed.

Now that the case is in their hands, Lojacano and Aragona go back to the notary to ask more questions. They get some answers Di Vincenzo failed to obtain.

Alberto goes out on a limb with a pretty amazing surprise for his pupils. Ida is quite concerned, but Alberto is adamant.

Giuliano Montaldo tells about how he got his start, from being a ham actor in Genoa to becoming an assistant to film director Carlo Lizzani, to making his first movie.

Lojacono, Aragona, and DA Piras go back to the crime scene to have a better look at the victim's collection of glass balls. The DA and Lojacono exchange ideas about the murder, but then he and Aragona have to go back to the station house.

Moscati has to prove himself at the exam, to demonstrate whether he is just presumptuous or can back it up by knowing what to do with the patient before him. His friend Piromallo waits for him outside, meanwhile.