Are there any books that are combinations of two or more pre-existing stories?
Are there any books that are combinations of two or more pre-existing stories? You know like for example Romeo and Juliet + Cinderella to make Romeo and Cinderella (this is a made-up example, I don't know if it actually exists, it doesn't exclusively have to be this). And it has to be explicitly stated or made clear that the story is a fusion of two or more pre-existing stories, I'm not looking for books that "kinda feel like X meets Y", cause a lot of stories could be described as "blank meets blank", I'd prefer it if the author made it clear that the story they wrote is a combination of X, Y, and Z.