First off, where do you classify a book like this? It's not exactly a romance. In some ways, it's more like a reader's guide, but it's a real book with a real plot instead of a character/location list.
Second, it took me a while to read it because unlike most of the books I've read of late, you can't skim this. Well, you could, but you'll miss a lot.
Interestingly enough, I suspect there were several scenes pulled from other books but they were done so seamlessly that they just fit.
And because frankly I'm a little speechless at the moment, I'll leave it at that.