The case has been solved, one gets the feeling that if the murderer had been Varricchio, a common ex-convict, instead of a promising biologist, son of a prominent professor, the outcome would have been more palatable to the city and to the press.

The police question the man they caught fleeing the martial arts center and are able to tie up a lot of loose ends. Gaetano and Sonia discuss the case over dinner, but the inspector's mind is elsewhere. Renzo is finally convinced that Camilla wasn't having hallucinations when she saw the nurse's body upstairs.

Lojacono is confident he knows how the murder happened and is able to trick Renato into saying something he couldn't have heard on the news.

Berardi and his men go after Marino Monti who is at the martial arts center. It was very upsetting for Camilla to see it all so close up. She has a drink with Gaetano to calm down.

Lojacono and Di Nardo go to see Biagio's ex-girlfriend to ask her one more question. She happens to remember something that gives them a new lead. They then go and talk to Renato, Biagio's friend and colleague.

Having read about Mattioli's death, Camilla rushes to Berardi's office, where he is checking some documents with Torre. She participates and comes across an interesting piece of information.

Laura and Lojacono go to Laura's house and she begins cooking dinner. At his hotel, Aragona has a chance to see Irene, the new housemaid, in the dining room and can't take his eyes off her. Francesco brings Giorgia breakfast in bed. It's una graffa (a kind of doughnut).

Renzo comes home late after a meeting and finds Camilla on the couch deep in thought. She lets him know she has been connecting the dots between the postcard and the merengue instructor. She goes off to bed but finds a surprise on the way.

At the hotel where Aragona stays, he tries to find out who the new housekeeping person is. Down at the police station, there is news concerning the prostitute Varricchio says he spent time with the night of the murder.

Lojacono goes to Letizia's trattoria and tells her about the bad news about the witness. She tries to reassure him but also has a new customer to attend to. Francesco can't let Giorgia go and sleeps in the car in front of her house.

After her trip to the Tiber River, Camilla goes to pick up Livietta at Giulio's house, where the two kids are dancing to Merengue. Camilla has some questions about that. Meanwhile, Berardi and Torre are busy with the coroner, identifying a corpse.

Varricchio is back in the DA's office and tells a different story, admitting he had lied the first time. But is there proof of his new version? At home, Lojacono is shocked by some news he hears on the TV.

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.

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.

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."