The Wicked and the Dead by Melissa Marr

In near-future New Orleans, Draugar, again-walkers, are faster and stronger than most humans, but not venomous until they are a century old. Until then, they shamble and bite. Since not everyone wants to see their relatives end up that way, Geneviève Crowe makes her living beheading the dead.

But now, her magic’s gone sideways, and the only person strong enough to help her is the one man who could tempt her to think about picket fences: Eli Stonecroft, a faery who chose to be a bar-owner in New Orleans rather than live in Elphame.

Then human businessmen start turning up as draugar.

Suddenly, the queen of the again-walkers and the wealthy son of one of the victims, both hire Geneviève to figure it out. She works to keep her magic in check, the dead from crawling out of their graves, and enough money for a future that might be a lotlonger than she’d like. Neither her heart nor her life are safe now that she’s juggling a faery prince, murder, and magic.