In August of 2014, the European Space Agency Rosetta probe reached the comet 67/P. This mission allowed for the collection of a great deal of data about comets. In fact, in this episode, a comet will be fashioned out of fairly common ingredients in a normal kitchen. That's pretty exciting.

Milena tells Imma about her pregnancy and about how Nunzio reacted to it. They also talk about Nunzios's relationship with his father. Imma and Calogiuri go out to the Festa place to talk to Rosario.

Libero goes to the radio station to try to find a job for Alberto. Guido goes to the garage to talk to Alberto.

The photographer gives Berardi some more details, but there is still the question of the missing gun. Potti and Bibì seem to have made up completely and Camilla and Renzo might not be in total agreement about what to do next.

Nora gets Germana on the phone to find out what's going on, since the wedding is just a couple of days away and she and Yazech are missing in action.

Manzi isn't getting anywhere with the kids at the reformatory. He talks to the director, and then goes to the Board of Education, too, to complain.

Imma has a difficult but necessary conversation with Rosario there, on his land, with the wind turbines whirring in the background.

Marcello does a pretty bad audition at the radio station. But somehow, things take an unexpected direction. Meanwhile, Libero seems very confused.

They discover the gun belonged to Francesca. Debbie talks to the class, and Camilla gleans a spark of information that might prove useful. Gaetano goes to talk to Camilla and she gives him a good talking too.

Alberto gets a friend to drive him to where Ida teaches. He recognizes her right away as the kids come out of the school.

Germana makes it back in the nick of time. But someone has been working on the roof, so there is a new mystery to solve.

Now that Imma has solved the case, she can think about other things. She talks to Diana on the phone, and then insists that Valentina go somewhere with her in the car.

Rebbi and Maria don't seem to be on the same wavelength about the trip to London. Back home, there's talk about frogs and a broken dishwasher.

Camilla has an interesting and enlightening conversation with Signora Voglino. For some reason, Berardi shows up, too.

Alberto sleeps on the park bench across from Ida's apartment and then goes to work at the prison, where, once again, it's an uphill battle.