Xander Chase and the Unicorn Code — Carrie Weston

Lilly Honey Star is a 15-year-old like no other; she is the sole survivor of a mass murder and is suspected of being the half-mad murderess. Detective Stacy has her doubts about Lilly's guilt, and when a stranger starts asking bizarre questions, she--along with Lilly--is pulled into the core of the case, which is bigger and more dangerous than they could have ever imagined.
Xander Chase, the angel of death and judiciary of spirits, is on the case. Desperate to make his father, Death himself, proud, Xander must unravel the perilous lies and deceit that's spread through the realms of sinister creatures, before the murderer's eye turns on him.