This episode comes to a close with the mystery of Cetinka solved, and everyone having a good time in the backyard. Maria proudly tells her aunt Alice how she duped her teacher into spending time with her alone. Lele lectures Ciccio (who really wants to wear his new shoes) about being truthful, but we know there's someone else he should have been lecturing... In fact, right on cue, an unexpected visitor shows up!

Commissioner Manara is back with a new episode, which opens, not only with the usual murder, this time in a library, but also with a care package from Manara's mother, full of Sicilian specialties such as melanzane sottolio or sott'olio, (eggplant in oil). Sottolio is a traditional and well-loved way of preserving many foods, and can be distinguished from sottaceto (in vinegar), or in salamoia (in water and salt). Of course, everyone at headquarters is more interested in the Sicilian pastries!

At the train station where Alessio had been kicked off the train, the police officer tells Alessio to call home to get picked up. Alessio does make a phone call, and he does get picked up, but not by his parents!

Encouraged by the woman who took him home with her, Alessio phones his mother and leaves a message. He then relaxes, and even falls asleep, but gets a rude awakening!

Murder in the library. The curator of the town library was found dead by his secretary, and the assistant librarian hasn't shown up for work. Some valuable correspondence is missing, and there are some suspicious shoe prints on the floor. Manara and his team have gotten busy trying to figure it all out.

Alessio resumes his trip, heading for the train station, but on the way, he runs into none other than his former boss, Antonino from the beach club.

Manara goes to see the mother of Fazi's missing assistant, Marcuccio. It turns out he's "different" but with a phenomenal capacity for numbers. He's also a big guy, with big feet! Meanwhile, Lara and Luca are called to their boss's office. He wants results, fast, and so he's called in an expert in Cultural Assets from Rome to work alongside them.

The arrival of Giulia Chiamparini, the expert in Cultural Heritage, makes quite a hit at headquarters!

Alessio discovers why Tonino was so upset. The beach club is in danger of being demolished.

Lara and Giulia have some catching up to do, but how candid are they being with each other? Do we detect a bit of jealousy? Meanwhile Commissioner Manara has to deal with both Romei, the chicken guy, and his buxom, brassy wife, who keeps trying to catch Luca's eye.

The police intercept a phone call between Marcuccio and his mother, but it's too short to trace. Marcuccio recites the first line of Leopardi's most famous poem, "L'infinito" [The Infinite] to his mother. Giulia spends the night at Lara's and they watch the movie of the famous party. The next day Lara has some interesting news for Manara, from both Giulia and from her aunt!

Anna and Marika tell us the story of Rosina, who in the midst of deception and intrigue, ends up getting married. But to whom? The one she loves, or the one who wants her at all costs?

Amidst murder and insomnia, Manara is attempting to eat his croissant during the autopsy in the morgue. And Ginevra... well, she has an infallible solution to help him get back to normal.

Alessio is back at the beach club and shares a bed with Tonino's daughter, Martina. Once again he goes to the train station to meet up with his friends in Amsterdam...

Lara and Luca go to interrogate a suspect whose only alibi for the night of the murder depends on Marcuccio, who is still missing. Meanwhile, Giulia intercepts a cryptic phone call.