The covers link to The Tattered Cover (to promote indie bookstores a bit) in case you'd like more info. Here's number twelve:
Spells, by Aprilynne Pike
What did I love about this? To begin with, it's the sequel to Wings, which I found to be a very unique look at Fae and faeries. In the first book, we learn that Laurel is a faerie (which means she has an actual flower growing out of her back). In this book, Laurel returns to the Fae world for classes. I loved the world building here. I loved the set up of the different 'seasons' of faeries. And (wait for it), I loved how Pike created a love triangle. (I know -- try not to faint.) Yes, the love triangle was already put into place in the first book, but here we learn more about Tamani (her fae love-wanna-be) and why he pursues her. When there's a strong reason why a MC is put between two others, then I can buy into it and enjoy reading about the tension and angst that produces. And this has a great reason.
The story: Laurel must return to the Fae world to learn of her heritage and responsibility, even though she's lived her days so far in the human world. But there are those who don't want the Fae to succeed, and they're still on Laurel's scent. The more Laurel learns about her true background and future, the more torn she is between the two parts of herself.
I recommend this to anyone who loved the first book -- and also anyone who likes thinking about dilemmas such as this, where one is divided between nature and nurture and which path to choose.