All the Hidden Monsters (Book One)

Sage is both an ordinary girl and a werewolf, trying to understand her place between different worlds. When her supernatural friend Lucy is murdered in the human domain, Sage insists on joining the investigation. The case is led by Oren Rinallis, a warlock detective with a dangerous past. Sage trusts her ability to detect a killer, even as conflict and distrust complicate her work with Oren.