I liked the oddity of this story and the title, but when I began reading it, I ran into some issues. The first is that it's your usual cliché of the ignorant special snowflake coming into their power and knowledge of who they are. The main difference here is that the demon-slayer here isn't your usual wilting, vapory YA girl. Lizzie Brown is an older woman who teaches kindergarten. We still get the story in first person though, which can be annoying, but in this case, it wasn't awful. She lives alone (save for her Jack Russell Terrier dog), in a loft apartment and is an adopted child, her mother having given her up when she was a baby. So lots of trope. The differences were not only in her age, but also in that there was humor here, some of which missed the mark for me, but some of which was funny, such as when she tells her little dog "Feel free to protect me from butterflies, the vacuum cleaner, my hair dryer". I thought that was great.
On Lizzie's birthday, her grandmother shows up out of the blue riding a pink Harley Davidson motorbike, and she locks Lizzie in the bathroom. She's wanting Lizzie confined while the latter undergoes her slayer transformation. Why this happens when she turns thirty (or whatever age she is) is a mystery, and it's even more of a mystery why her grandmother locks her up and refuses to tell her anything - this again is tedious trope. What goes wrong though is that a demon shows up intent upon killing Lizzie, but it's told in more of a humorous vein than a dramatic or scary one. After this event is when Lizzie starts to get her education. She also realizes she can hear her dog - which talks like a frat boy rather than a dog might talk if it could - and which became annoying quite quickly, the occasional humorous comment notwithstanding.
The story really started sliding towards oblivion for me though, when the clichéd muscular, protective male showed up. I'm not a woman (I've never even played one on TV, believe it or not), but if I were a woman, I think I'd be a bit pissed-off with some stranger showing up trying to lay a claim on me and arguing with my grandmother about who has dibs on me! But the problem was much worse than that. Here we have this almighty demon-slayer, who comes along only once in three generations, and who is so scary to demons that they launch an orchestrated campaign to kill her off, and yet she needs protector? This immediately devalues her and renders her as little more than a maiden tied to a stake awaiting Saint George to come along and slay the dragon before he carries her off on his pretty charger (and by that I mean horse, nothing untoward!).
It felt like a betrayal to me. It's fine by me if she has a guy who is an equal partner, and it's also fine if, assuming it's done intelligently and realistically, they fall in love by the end of the story, but to set up this woman as some exceptional demon destroyer and then slap us (and her) in the face with "well, she's really just an air-headed and weak flibbertigibbet" is inexcusable.
It was at this point that I decided this book was not for me - or for anyone else who likes a smartly-written urban fantasy and female protagonists who have a healthy self-respect and are not in dire need of some abusive male to validate them. As soon as Dimitri (seriously? You couldn't come up with a better name than a Vampire Academy retread?) started asserting ownership of Lizzie, and literally manhandling her around - like dragging her into a corner to lecture her, and insisting she leave her bedroom window open so he can "talk to her later," and actually kissing her without so much as a by-your-leave - I'm leaving! Lizzie should have kicked him in his balls right there and then. She didn't. She's having palpitations and marveling at his muscles instead. He's just man-meat and she should have been marveling at the lack of muscle in his head. If you like moronic female leads, and guys who are outright dicks, then this is definitely for you. For me, I couldn't bear to read any more of this nonsense.