I'd heard a bit of buzz about this one ... not available at the library, so when I indulged in KU for a month, I borrowed the Kindle copy, and added audio as it was inexpensive w/whispersync. I started with the audio, but my mind kept wandering. I had to stop, turn to the kindle copy, read, and then return to the audiobook. I was finally able to finish, and I liked it, didn't love it. I'll probably read the sequel, I haven't decided yet. The text is in KU, but the audio is a little more expensive, and the preview had Raihn/male narrator ... and that wasn't the voice I thought of with him, based on the first book's audio (just the female narrator voicing his dialog). 

This had a HungerGames feel for me ... contestants competing in difficult challenges, sometimes working together, but ultimately, only one can win(survive). And yes, an attraction between two contestants. Here, it was their choice to enter (unlike HG). Having read the IronFlame series, there was a little similar feel to that too (especially with all the profanity... x244, sex and violence). Here, it's vampires, with wings and powers. 

There were some twists and turns, not exactly how it would, or could, finish up ...