As with many teens, my first jobs included babysitting and mopping floors at McDonald's. Since then, I've held jobs a diverse as selling used cars, selling apparel, cosmetics, and real-estate, substitute-teaching six graders, teaching undergraduate creative writing, and working as an editorial assistant for a literary magazine.
The distinctions of what makes a book one genre or another can sometimes be a bit muddy, but generally it's a matter of projecting who the audience will be, which is a judgment that's based on the subject matter. 'Mainstream' is the cleanest label for a book that draws readers of both sexes and from a wide age-range.
I went looking for some preliminary information, and very quickly was struck by the sort of way the surface-level knowledge about Zelda doesn't begin to describe the person that she really is. You know, I had come to the project with the idea that she was, you know, just F. Scott Fitzgerald's crazy, disruptive wife.