The disappearance of her old friend, Lila Cerrullo, causes 60-year-old author Elena Greco to reflect on the early days of their friendship in 1950s Naples, when Elena and Lila are two very different girls at the top of their class. When the girls discover the underground lair of Don Achille, a criminal figure who controls the neighborhood, they decide to confront him, facing their fears together and laying the cornerstone of a lasting friendship and rivalry.

Now a teenager, Elena grapples with the onset of puberty, her studies, and her friendship with Lila, who now works in her family's shoe-repair store. After a library awards ceremony reveals what Lila has been keeping secret, Elena learns what her friend's grand plans might be. As the girls' encounters with the opposite sex become more and more frequent, Lila takes a stand against the dangerous Solara brothers.