Scarlett Bernard, book 1: Dead Spots
Melissa F. Olson2012

Scarlett Bernard knows about personal space: step within ten feet of her, and any supernatural spells or demonic forces are instantly defused—vampires and werewolves become human again, and witches can’t get out so much as a “hocus pocus.” This special skill makes her a null and very valuable to Los Angeles’s three most powerful magical communities, who utilize her ability to scrub crime scenes clean of all traces of the paranormal to keep humanity, and the LAPD, in the dark.

But one night Scarlett’s late arrival to a grisly murder scene reveals her agenda and ends with LAPD’s Jesse Cruz tracking her down to strike a deal: he’ll keep quiet about the undead underworld if she helps solve the case. Their pact doesn’t sit well with Dash, the city’s chief bloodsucker, who fears his whole vampire empire is at stake. And when clues start to point to Scarlett, it’ll take more than her unique powers to catch the real killer and clear her name.