Sofia goes up to the roof to practice her cello, but ends up singing a song (in English). When Maestro Marioni gets home from an amorous encounter, he watches a video where Matteo's previous violin teacher introduces him and explains his special situation.

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Lojacono and DA Piras arrive at the scene of the crime and meet Don Michele. The next morning Lojacono goes with Di Nardo to talk to the kids who had been in the parish hall with the victim.

Matteo seems fine but his father and uncle are worried about him. Marioni learns why Matteo is described as fragile and makes some decisions regarding the orchestra.

At home, there is the usual rush to get ready for school and work. Camilla is running late and is not available to answer a burning question her husband and daughter have for her.

The young volunteers talk about how they met and what they were doing the night of the murder. Aragona and Romano come back to headquarters with a photo they found at the victim's home.

Camilla and her class are on a field trip to the theater and she is trying to hand out the tickets, but lots is happening outside, involving the other teacher, an out-of-work actor, the students, some picture-taking, and some trouble down the street.

Lojacono surprises Laura at dinnertime. Di Nardo has dinner with Rosaria, who has an invitation for her. At the dinner table, Giorgia has something to discuss with Francesco.

Berardi is back in the Rome office and there's a celebration. But since there's also a dead person at the Colosseum, the celebration comes to an abrupt end and Berardi and Torre rush to the scene of the crime. The class trip also comes to an abrupt end.

A parishioner shows up at police headquarters with photos she thinks are compromising. Lojacono and Alex then go to question the volunteers as to whether the insinuations could carry any weight.

After two years, Camilla and Gaetano meet up again at the scene where a woman had been found dead. They fall into their usual habit of discussing the crime, as if not a day had passed.

Lojacono and Di Nardo go to speak with Don Michele again, when Mass is over. The priest confirms that he and Angela cared for each other very much but that they didn't have a relationship. He is being rather defensive, but Lojacono gets him to agree to cooperate.

Gaetano receives a phone call and when it ends, he finds himself obliged to tell Camilla that it was from a journalist he had met in Prague. Back at school, Camilla wants to know more about the centurion, while Renzo is dealing with a problem at his studio.

Aragona and Romano go around with the photo they had found, asking questions of guys who might recognize him. At one point, a young man comes out of the bar and starts running, pursued by Aragona.

A chaotic day in Italian class: Amid grammatical difficulties, unexpected incidents, and group dynamics, tensions, irony, and solidarity intertwine among students and teachers.