The Soul's Alliance (The Agents Series Book 2)

Konstanz is pretty sure her best friend is a demon hunter. A demon hunter with a broken heart.
That's a very dangerous thing indeed.
Being the good friend that she is, Konstanz will protect Navi from any more heartache, even if it means putting up with Bryson, the guy determined to make Navi forget she ever hurt in the first place. Never mind that Konstanz can't stand him and he likes her even less.
Until he doesn't. Feelings change, people change, and Navi's dangerous secrets put them all in danger. In the shadows of monsters, Konstanz loses her heart only to find that Bryson has dangerous secrets of his own.
Secrets that threaten everything they've fought for.