Isn't the Fourth Flavor in Neapolitan Ice Cream?

This week i read the book my brilliant friend, by elena ferrante. I know that aferante fever is a thing that people have been suffering for about a decade now,. If not longeres ge vaccinated people. Ah. This is the first of ferrante's four neapolitan novels. Usually there's three flavors in neapolitan Novels and Milly found the fourth flavor - pistachio.