Full disclosure: I couldn't finish it. I forced myself to read to page 100 and then decided I would rather do just about anything than read this book. I took it to the playground to read while the kids were on the flying fox, and at one point I decided it was more interesting to stare at the sky than read this book. 
 Half of the problem was the writing: It was clunky in a way that seemed designed to appeal to a tween audience (e.g. when the eponymous narrator informs the reader that all vampires have red hair and all humans with red hair have some vampire ancestors: "OMG! I knew it! I knew I had some vampire blood!"). The humour is heavy-handed and gimmicky and thus not remotely funny (e.g. the demon who colonises her living room and then spends all day and night watching TV buying crap on the Home Shopping Network until she convinces him to turn into a cat and then drugs him with catnip). 
 The second half was the unappealing characters. It's hard to like a main character who opens the book by ensnaring and then killing her friend, simply because she's told to by some bossy triumvirate of vampires (one of whom is her grandmother) for whom she works as an assassin. She spends the next 75 pages periodically regretting it. Are we supposed to feel sorry for her because her cold vampire grandma made her kill her friend? No, it just makes her even less appealing, because she never has the balls to stand up to vampire granny. (At least, not by p.100.) Then she heads off on an undercover mission to infiltrate the cult headquarters of vampire granny's political opponent, and we keep getting told that the cult leader, who is described as being like a televangelist and super creepy, makes her "panties wet," and sorry, that's where Ms Wells lost me, because how can I relate to a heroine who is sexually attracted to a cross between Pat Robertson and Tony Robbins? 
 Not only is this not a keeper, it's also not a book I would give away to anyone, because I frankly don't think I know anyone who would like it. (I hope I don't know anyone who would like it.) Straight to the recycle bin.