I think this is what happened with this book. The editor told the author to write a book about vampires because vampires are hot in teen lit. The author then rolled her eyes and thought fine, if you want a vampire book I'm going to make it absurd. Then she wrote a terrific and serious book with the most absurd characters and twists (were-unicorns anyone?). This made for a book that was both compelling and well plotted but also hysterically funny in it's small moments of absurdity. I couldn't put the book down and loved it.
Appropriateness: There is no adult content in this book (aside from a little nudity because of clothes that had to be burned). The main character is seventeen and acts her age. The romance is sweet and fairly innocent. I would recommend this book to both older and younger YA readers 12+
