What Fate Portends, by Clara Coulson. This is book 1 of The Frost Arcana series.
I have to say I enjoyed this book, it has just the right amount of action and suspense. Vince is half fairy and half human, and an ex-cop. His current job, after being ousted as a paranormal, is finding things people left behind. He will do his best to save both his human friends and his fairy kin from an unknown force set on destroying both his worlds.