Oh, I don't know. I tend to buy into the idea that, "There's nothing new under the sun." I think what's new about a book is what you do with an old idea, and not the idea itself.
For example, I haven't read Wicked yet, but it's on my list. It's an old story that's been done a million times, but it's twisted a new way. Those are my favorite kind of stories. Perspective can change everything.
I'm tired of vampire erotic fiction, but I wouldn't mind reading a different type of story with a vampire in it. I recently read Vampire Huter D (only the first book was enjoyable), which is a western-style, sci-fi, vampire story. I rather liked it.
I've actually never read a published novel about angels that wasn't Christian Fiction. Maybe they're out there. I haven't seen them, which is why I decided to toy with Enoch.