Burning Up — Michele Lang

Marcy, a young Boston mage, works in a spellworkers' boiler room on the wrong side of town. Magical malware in her brain threatens both her friends and her livelihood.
Meanwhile, Marcy's boss, a wolf shifter up against the full moon, grapples with secret demons of his own…
And a malevolent, relentless evil threatens to destroy them both.
On the midnight streets of Boston, Marcy fights fire with fire -- but if she doesn't win she won't make it until morning.
A story in the collection Bewitching Love, of the Uncollected Anthology.