The quartet of Italian books known collectively as The Neapolitan Novels are apparently A Big Deal, and one that I had absolutely no idea existed until I heard about April De Angelis' stage adaptation (which originally played at the Rose Theatre Kingston, and now transfers in expanded form to the Olivier.) All I've really gleaned is that their author, Elena Ferrante, doesn't actually exist, being a pseudonym shrouded in secrecy. It's no doubt a huge part of the novels' popularity and mythos, given that their narrator is a popular novelist called Elena, better known as Lenù (Niamh Cusack,) who flashes us back to 1950s Naples and her first meeting with Lila (Catherine McCormack,) who stole her beloved doll and threw it into the cellar of the local mob boss. Lenù did the same to hersin revenge, and their (unsuccessful) adventure into the cellar to retrieve the dolls bonded them in a tumultuous friendship.
