Sunny is a fox spirit. She has hidden from the world of gods for the better part of a century, leading a quiet, boring life. When Ethan, a face from her past, turns up unexpectedly seeking help to get justice for his brother's murder, flying under the radar become more difficult. An ancient evil is stirring, and Sunny soon discovers destiny can't always be outrun. 

Maybe I have just read too many books recently with the whole I-can't-love-tgem-because-it-will-endanger-them-so-I'll-lie-and-hurt-then-instead-of-talk-about-it, but I'm starting to find it a bit annoying. Towards the end of this book, I found Sunny selfish and self-serving, looking for an excuse to end things with Ethan and become a martyr. I felt like this undermined their past and their whole relationship throughout the book, and if they'd just talked it out the ending would have been so much better. 
That aside, I really liked Sunny. She was bold and sassy and a really interesting main character with a deep back story that was explored during flashbacks every now and again. I liked Ethan's character growth and his protectiveness of Sunny; he was just a good guy. 
The book was heavily influenced by Korean mythology, and the descriptions of Korea when they arrived were beautiful. I felt that the author really knew the source material and brought it into a modern setting well.