This article tries to highlight some issues related to subject indexing applied to fiction, with a focus on how it could be implemented on children's literature and then also on adults fiction. In fact, Italy is one of the country that does not add subject indexing to fiction, and despite the numerous and ongoing debates on this topic there is not any National plan to solve this issue. Users who requires more this kind of research are children and teenagers: children’s literature, in fact, is involved in some interesting steps on subject indexing applied to fiction, even if this initiative is carried out in an independent way by individual library networks.