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.

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.

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.

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.

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.

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.

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.

Lojacono is on a video call with Marina, his daughter, and her friend Chanel, when he gets a phone call from headquarters and goes to a new crime scene, to see what's what.

Sofia is practicing cello when her brother asks her for a favor. His girlfriend Ilaria comments on Sofia's weight.

In a church basement, a priest leads some young people in singing to celebrate the eighty-first birthday of Mariolina. Caterina goes to find Angela, who is late with the cake.

Sara is home at dinner arguing with her mother who finds her unbearable. Sara's phone rings with an audio cue indicating the caller. Robbo and his sister Chiara are going home on the tram when, out the window, they see someone they think they recognize.

Barbara is practicing piano in the presence of her mother, who tries to encourage her. Little by little Barbara manages to focus on the music, and perhaps not only the music. Another pianist is playing the same piece in a music store. He might be there because he has no piano at home.

Matteo is at home with his uncle, doing a tricky jigsaw puzzle and ready for dinner. Even though it is clear to Matteo that his uncle is gay, his uncle is very uncomfortable talking about it. Matteo lets his uncle know that there is a girl he likes.

A colleague of Marioni's chides him for having treated Matteo as he did. He tries to justify his actions, and then goes to have a word with Rosario, a percussion student.