Revenge of the Bone Witch by Kerry Keller

Time is up and overdue.
Now the Reapers are after you.

For the monsters of Purgatory, New Orleans is the perfect hotbed to hide in. Their haunted houses, voodoo museums, and labyrinthine cemeteries are vast enough to blend in with their humanity. But not everyone wants to abide by the rules, and that’s where I came in—a Reaper.
I’m Ravena Clarke, and it’s my job to track them down, send them back, or take care of them by any means necessary.
But I may be lost in the bayou without a paddle when an old Bone Witch returns and threatens to wipe out the city. She’s already swept Frenier off the map once when she was alive over a century ago, but now she’s back and looking for vengeance.
I can play nice with monsters, but only if they say please first.