Realms of Mist and Ash — J.S. Malcom

Getting into Faerie is risky enough. Getting out again may prove impossible.

Entering Faerie is enough of a risk, never mind trying to free a changeling. That's never been done before, but that's exactly what has to happen if I'm going to rescue my best friend. So when I run into a half-blood thief who offers to help, I can't exactly say no. I mean, the guy seriously hates the fae. After all, one of them knocked up his mother. 

Digging deeper into the labyrinthine fae city kingdom, we soon start to unravel a mystery I never could have imagined. Namely, how it came to be that just a few fae now control all of the magic in their world. We also learn that some of the missing humans have been spotted. Not my friend, but we must be getting closer. But when I get waylaid by fae slave traders, find myself stripped of magic and held captive in a noble house, and discover a secret that might turn the tables of magical power in Faerie, I end up with way more than I bargained for. But I also seem to have caught the eye of a stunningly handsome fae lord. Hard to resist. And who knows? Maybe he could come in handy. Because right now it's down to me and I'm up against a ticking clock. It's either escape or die knowing that the next stop for fae magical conquest is the human realm.