Fairy Godmurder - Fractured Fae, #1

Gwendolyn Evenshine thought being a fairy godmother would be cut and dried-take on a charge, solve a royal problem, and return to the Academy for her next assignment. But she got too close. When the beloved Princess Francesca is brutally murdered on her watch, Gwen refuses to resume her fairy godmother duties. Instead, she laces her docs and hits the streets of Boston in search of the bastard who took Frankie from her, a serial killer who operates in lunar cycles.
But Gwen's magic is on the fritz, and bodies are piling up. Gwen enlists the talents of Chessa Moon, an upbeat pixie crime blogger who will do anything for a scoop. Together, they open new leads as they race against the hunter's moon. As the killer hits closer and closer to home, Gwen is forced to confront her past and nail the killer, or she'll lose more than just her shot at vengeance-she'll lose the only person in her life worth a damn.