Heat Stroke [Rachel Caine]
I wasn't expecting Jo to become human again at the end, I'd expected her to be a Djinn again. I hadn't expect Kevin to go crazy, either but it shouldn't have surprised me that much. I'm wondering how Yvette trapped Jonathan, but I guess it wouldn't have been that hard as long as she had the bottle with her.
It was been years since I read the first book in this series, but it wasn't all that hard to remember after I started reading this book. One good thing about series novels.